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Colleen Grobstok

Kirkland, WA
3.0C year-end 2025
147 matches · 68W–79L · seasons 20192026
Bump probability
2.53.03.5lowhigh

Where this rating stands today. Taller means more likely. The dashed lines are the band edges, and the three shaded areas are the three percentages below.

2.96
estimated dynamic rating
Where the rating sits now, on 21 matches this season · USTA never publishes this number
0%
down to 2.5
71%
stay 3.0
29%
up to 3.5
Projected to December: 0% down · 93% stay · 7% up, from a year-end estimate of 2.88. Lower than today’s 2.96 because form regresses — players this far into their band partway through a season have historically finished nearer the middle of it. Keep playing at this level and the numbers above are the ones that hold.

A 3.0 runs from 2.51 to 3.00. This rating sits in the top of the band, and every match moves it.

Our estimate, not a USTA figure — scale measured at this point of 2023 on 2160 players. Graded publicly in December when USTA publishes year-end ratings. It moves when you play, and occasionally when we improve the model.

Where you rank
Kirkland · 3.0
20 of 31
WA · 3.0
330 of 755

Colleen is ranked among players at the same level in the same place, by our estimated dynamic rating — not the published level, which is the same for everyone in the band. Groups smaller than five are not ranked, because a placing out of two is noise dressed as standing.

Over timerating by season, and how you rank
Rating by season

Colleen has played at 3.0, 3.5 across 8 seasons — 1 move up and 1 down.

2.53.03.520192020202120222023202420252026

The line is our estimate; the horizontal lines are level boundaries, so crossing one is a bump. Hollow points are years we inferred from the level played the following season, because USTA publishes a current rating but no history.

How you rank at your level
At 3.0, Colleen has gone from the 66th to the 85th percentile of players at that level, 2019 to 2026.

Percentile compares the same level in the same season, by share of games won. Mixed is shown for context — USTA rules exclude it from your adult rating unless mixed is all you play.

By level6 levels played
3.0
67.3%
35W–17L · 54.7% of games
3.5
31.6%
12W–26L · 45.4% of games
6.0
57.1%
4W–3L · 60.4% of games
7.0
42.9%
3W–4L · 47.7% of games
6.0mixed
0%
0W–9L · 32.7% of games
7.0mixed
34.6%
9W–17L · 42.4% of games

Games won matters more than matches won — NTRP adjusts on margins.

Match history147 matches
L
Sen Saetern / Maile Intrachatmixed
2026-06-14 · #3 Doubles · 7.0 · with Kristen Grobstok
+0.000below expectation — took 25% of games against 32% expected
6-2, 6-2
W
Betsy Chamberlin / Suzan Chavez
2026-06-02 · #3 Doubles · 3.0 · with Amy Wang
+0.015better than expected — took 71% of games against 60% expected
6-3, 6-2
L
Jacky Grotle / Monika Sharma
2026-05-22 · #3 Doubles · 3.5 · with Shelly Enstrom
+0.023better than expected — took 52% of games against 41% expected
7-5, 2-6, 1-0
L
Joanna Hennessy / Robin Hoover
2026-05-12 · #3 Doubles · 3.0 · with Katie van Zyl
0.043below expectation — took 32% of games against 53% expected
7-6, 6-0
W
Abby Wagner / Caroline Wagner
2026-04-22 · #1 Doubles · 3.0 · with Dana Laursen
0.025below expectation — took 63% of games against 68% expected
6-3, 6-4
W
Naomi O'Leary / Natalie Warner
2026-04-14 · #3 Doubles · 3.0 · with Linda Greenlaw
0.000about as expected — took 44% of games against 47% expected
1-6, 6-4, 1-0
W
Aliya Khan / Marcia O'Donoghue
2026-04-07 · #2 Doubles · 3.0 · with Dana Laursen
0.000about as expected — took 63% of games against 61% expected
6-3, 6-4
L
Jade Phan / Kathy Wangchamps
2026-03-28 · #2 Doubles · with Mary Jean Waite
0.028below expectation — took 41% of games against 54% expected
7-5, 6-4
W
Kim Hardwick / Raluca Hera
2026-03-25 · #2 Doubles · 3.0 · with Mary Jean Waite
0.015about as expected — took 71% of games against 70% expected
6-3, 6-2
W
Lisa Small / Emiko Hobbschamps
2026-03-22 · #3 Doubles · with Elizabeth Graves
0.003about as expected — took 55% of games against 56% expected
4-6, 6-3, 1-0
W
Minda Brusse / Sheila Connolly
2026-03-14 · #2 Doubles · 3.0 · with Dana Laursen
+0.013better than expected — took 71% of games against 61% expected
6-1, 6-4
W
Caiping Zang / Cecilia Verastegui
2026-02-21 · #2 Doubles · 3.0 · with Mary Jean Waite
+0.010better than expected — took 86% of games against 70% expected
6-0, 6-2
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