Soccer, Hoops Next to Seed Using MPR
August 6, 2019
By Rob Kaminski
MHSAA benchmarks editor
As the topic of seeding for MHSAA Tournaments continues to swirl in the air of numerous committee meetings on an annual basis, one of the primary concerns continues to focus on the simple question: “How?”
The MHSAA for years has been working behind the scenes on potential formulas which could best be used as a standardized tool to assist in measuring strengths of teams in a given sport.
This spring, the MHSAA introduced the Michigan Power Rating in the sport of Boys Lacrosse. The Representative Council approved limited seeding beginning in 2019-20 for girls and boys soccer and girls and boys basketball, and MPR will be the metric to determine which two teams must be seeded on opposite sides of District brackets in those sports.
“The boys lacrosse tournament has been seeded since it was added as an MHSAA-sponsored sport in 2005. The seeding is done by committee based on several criteria, one of which was statewide power rankings generated by a third-party website. In the Fall of 2018, that website ceased operation – it was the perfect opportunity for the MHSAA to develop its own data-driven, purely objective ratings system and incorporate that data into the seeding criteria,” said Cole Malatinsky, administrative assistant for the sport.
“The benefits of the new MPR system have been already mentioned – it is MHSAA controlled, simple, objective, and transparent, and it can be used by other MHSAA sports in the future.”
MPR is a computer rating formula similar to the popular RPI rating. MPR provides a way to measure a team’s strength relative to other teams, based on games played against other MHSAA tournament teams, largely on the strength of their opponents’ schedules. MPR is purely objective using only the game results listed on MHSAA.com – there is no subjective human element.
What is the basic MPR formula?
MPR is calculated using wins, losses and ties for games played between teams entered into the MHSAA tournament. The final MPR number is 25% of the team's winning percentage, plus 50% of its opponent's winning percentage, plus 25% of its opponent's opponent's winning percentage.
MPR = (.25 x W%) + (.50 x OW%) + (.25 x OOW%)
The MPR formula can be applied easily to other MHSAA team sports.
What game data is included in the formula? What game data is not?
MPR looks only at results between opponents entered into the MHSAA postseason tournament. Wins, losses and ties in multi-team shortened game tournaments (lacrosse, soccer) also count. Forfeits also are counted as wins and losses.
MPR does not use the specific scores of a game or the margin of victory in a game. The location of a game is not included in the MPR formula, and the formula weighs results at the beginning of the season the same as results at the end of the season. Scrimmages are not included.
Why use the MPR formula?
Different rating systems have been used in the past or have been recommended to the MHSAA. We wanted to have a rating system where the data was controlled and stored in house and could be used for any sport featuring head-to-head competitions.
With its own rating system the MHSAA also can control the different components of the formula, thus keeping the tenets of scholastic competition at the forefront (like not including margin of victory in the formula). Finally, by listing all scores and team schedules online, as well as showing the MPR calculator on each team schedule page, the ratings are transparent and can be replicated easily.
CALCULATING MPR
What are the detailed components of the MPR formula?
You need three numbers to calculate your MPR: winning percentage (W%), opponent’s winning percentage (OW%) and opponent’s opponent’s winning percentage (OOW%).
How do you calculate winning percentage (W%)?
Divide the number of wins by the number of total games played. A tie is worth half a win. For MPR purposes, find the winning percentage against all teams that will play in the MHSAA tournament (MPR W%). Games played against out-of-state teams, varsity “B” teams, junior varsity teams, non-school club teams, and any other non-MHSAA tournament participants should not be included when calculating winning percentage. W% should be an easy number to calculate.
How do you calculate opponent’s winning percentage (OW%)?
Average the winning percentages of a team's opponents. When calculating the winning percentage of a specific opponent, use the opponents "Adjusted Winning Percentage" (ADJ W%). Adjusted winning percentage eliminates all games the team played against that opponent (as well as its games against non-MHSAA opponents).
For instance, if the team beat an opponent with an overall record of 4-1, use a record of 4-0 (1.000) for that opponent. If the team lost to an opponent, use a record of 3-1 (.750). Find the ADJ W% for all opponents, and then take the average. If a team plays an opponent team twice, that opponent’s ADJ W% will be counted twice.
OW% is not calculated via the combined record of the opponents; instead take the average of all opponent’s winning percentages.
How do you calculate opponent’s opponent’s winning percentage (OOW%)?
Use the same process described above, except calculated for the opponents of a team's opponents. This number is much harder to manually calculate, so the OW% for every team is listed on the MPR page of the MHSAA website.
Again, simply take the average of all opponent’s OW%.
How often is MPR calculated?
MPR is calculated about every five minutes. Enter a score and a minutes later the team MPR and the MPR of all the team's opponents will update.
How much will my MPR change throughout the season?
You will see wild MPR swings in the beginning of the season, but after about 10 games played your MPR will start to level out. At 20 games played you will see very little movement with each additional game played.
My score is missing. How can it be added?
This is a crowd-sourced system. Any registered user of MHSAA.com can add a missing score. ADs, coaches, parents, students and fans all can login and enter a score for any game.
What are some common errors when calculating MPR?
When calculating your team’s winning percentage, only include games against MHSAA-tournament teams. When calculating your opponent’s winning percentage, don’t include the games they played against you. When calculating ties, count the game as a half-win and half-loss.
What happens if a game is cancelled?
Because the MPR system works off of averages, it will not make a difference in the final MPR if a game cannot be rescheduled. It would not penalize, nor benefit, any team involved in that scenario.
USING THE WEBSITE
Where can I find game scores?
A list of statewide scores for all sports can be found in the MHSAA Score Center. To find a schedule for any team click on “Schools & Schedules” in the top navigation bar, search for the school, then once on the school page click the sport. You can also see a list of all schools (with links to schedules), on the statewide MPR list.
“We continue to have great success in score reporting for varsity boys lacrosse contests. While we state that schedule submission and score reporting to MHSAA.com are required, athletic directors and coaches understand that in order for MPR data to be accurate, we need consistent and accurate score reporting,” said Malatinsky. “MHSAA.com is now the primary site for high school boys lacrosse schedules, results and ratings in the state.”
How should I use the statewide list of teams and MPR?
Linked to the boys soccer page (and eventually to be added for both basketball pages and girls soccer) is a statewide listing of all Michigan Power Ratings (MPR) for teams entered into the MHSAA postseason tournament for that sport. Linked on the MPR page is an explanation of the District draw formula, describing when and how teams will be placed on the bracket.
The MPR data updates every five minutes. Click on the column headings to sort the data. You also can use the drop-down menu to show teams in one Division, or type a District number in the box to filter teams for that District (Region for boys lacrosse).
You also can click on any school name to go to its schedule page.
How do I read the school schedule page?
The schedule at the top of the page shows the date and opponent for all scheduled games, and results for games already played. If results are missing, click “Submit Score” to add a game score.
Below the game schedule is the MPR Calculator. The calculator is split into three sections. The first section shows the three MPR component scores for the team, as well as the team’s current MPR score. The second section shows the MPR information for the team’s opponents – specifically, for the opponents the team already has played (actually, for games where scores have been submitted). Only these games are included in the MPR calculation.
The third section highlights future opponents. The MPR data for future opponents are not used in the MPR calculation for the team.
PHOTO: East Kentwood and Ann Arbor Skyline play for last season’s Division 1 boys soccer championship.
Genesee's Zinn Setting School, Family Records While Climbing MHSAA All-Time Lists
By
Paul Costanzo
Special for MHSAA.com
January 7, 2026
Averie Zinn had a front-row seat as her sister Ryleigh re-wrote the Genesee girls basketball record book.
As a middle school student, and then freshman teammate whose parents are the Genesee coaches, Averie saw exactly what it took for Ryleigh to get there.
She also had a pretty good idea of what would be required to overtake her.
“I remember when I was little I was like, ‘Yep, I’m breaking all her records,’” Averie said. “My mom’s sister, she held all of those before. But I just remember when Ryleigh was getting those records, I was like, ‘Well, I’m going to break them.’”
Averie Zinn has broken those records and then some, splashing her name across the MHSAA record book with most of her senior season still to go.
She’s scored a school-record 1,892 points during her career, and with a per-game average this season of 39.8, could surpass 2,000 by the end of next week – making her the 34th girls basketball player in state history to eclipse it.
If that average holds throughout the season, and even if the Wolves play the minimum number of games remaining, Zinn could become just the seventh female in the state to hit 2,500 points.
That, of course, is a projection of where she could be, but she already appears 20 times in the MHSAA record book.
Her 851 points scored a year ago are third highest in a single MHSAA season. Seven of her single-game scoring performances are listed, including five games of 50 or more (she’s added another 53-point performance already this season that is not yet listed).
Her 21 points in a single quarter are tied for third all-time – she’s since hit 22, which will tie her for second.
She made 186 free throws a year ago, 10th-most in a single season, and has three games of 15 or more makes from the free-throw line.
Then there’s the steals: Two seasons in the top 12 all-time with 218 a year ago (third) and 170 as a sophomore (tied for 12th), and five games with 15-plus.
“I just think it’s such a blessing,” Zinn said. “No one really gets that opportunity, it’s such a select few amount of people. I almost don’t even think I’ve processed it. I think it’s really cool, and the fact that it’s happening with my parents coaching me, it’s really cool.”
Zinn, a 5-foot-10 point guard who also takes the opening tip for the Wolves, has scored 199 points through five games this season, going over 30 in four games and over 40 in two of those four.
She’s recorded 48 steals, as well, going for double digits (11, 12, 16) in each of her first three games.
“I mean, she’s 100-percent locked in,” said Genesee coach, and Zinn’s dad, Mike Zinn. “She’s been training hard with strength and conditioning, working on her range – a different range. Normally, she shoots from pretty deep, from nearly halfcourt like it’s nothing. But she’s been wanting to work on her mid-range game a little bit.”
As the Zinns have had their successes, so has the Genesee program. This year’s team is off to a 4-1 start, and last year the Wolves won a District title and advanced to a Regional Final in Division 3 for the second time in program history. The first came during the 2022 postseason.
Both of those seasons resulted in 17 wins, which is a school record.
The District title in 2022 was the program’s first since the mid-1990s, when their mom, Megan was playing.
“Mike and I graduated from Genesee High School, and we were the last ones to win a District title,” Megan Zinn said. “We decided to stay in the community, raise our kids in the community and coach here. It’s bigger than basketball. We believe we could work to put Genesee on the map, and that’s exactly what we’ve done. Last year, going to the Sweet 16 was the furthest we’ve ever gone. We lost both times, but just to say that we could get there while coaching both of our daughters is pretty special.”
When Averie Zinn is done breaking records at Genesee, she will continue her basketball career at Wayne State University.
She committed this past summer to play for the Warriors, a program she’s felt connected to for years. Not only is assistant coach Andy Ayrault a family friend, but Zinn caught the eye of head coach Carrie Lohr while hitting deep 3-pointers as an eighth grader at a team camp.
“I’m really excited,” Zinn said. “I’m getting more and more excited, especially since the new year is here and knowing this is the year that I’m going away and playing there. I know a lot of my teammates already. Wayne State feels like another home to me. That’s what was most important in my decision.”
Genesee won’t be without Zinns, either. While Mike and Megan will continue coaching, there’s also another player coming through, as Averie and Ryleigh's younger sister Maylee Zinn will be a freshman next season.
“I’d say the (age) gap for me and Maylee is like one year too far,” Averie said. “Me and Ryleigh played together, we would go to trainings together. We got super close that year (they were teammates). I always say that to my mom, that I wish I was back a year so I could get that year with Maylee. She’s pretty good.”
Paul Costanzo served as a sportswriter at The Port Huron Times Herald from 2006-15, including three years as lead sportswriter, and prior to that as sports editor at the Hillsdale Daily News from 2005-06. He can be reached at [email protected] with story ideas for Genesee, Lapeer, St. Clair, Sanilac, Huron, Tuscola, Saginaw, Bay, Arenac, Midland and Gladwin counties.
PHOTOS (Top) Genesee’s Averie Zinn (0) gets to the rim during her team’s 71-30 win over Birch Run on Dec. 22. (Middle) Zinn elevates for a shot while defended by a pair of Panthers. (Photos by McInchak Family Photography.)