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Debbie Sierra

Pasadena, CA
4.0A year-end 2025
78 matches · 34W–44L · seasons 2019–2026
Bump probability
3.54.04.5lowhigh
Where this rating stands today. Taller means more likely.
i
The dashed lines are the edges of your band. The three shaded areas are exactly the three percentages below — area here is the chance of one outcome for you, not a count of players.
3.93
estimated dynamic rating
Where the rating sits now, on 19 matches this season · USTA never publishes this number
0%
down to 3.5
82%
stay 4.0
18%
up to 4.5
Projected to December: 0% down · 96% stay · 4% up, from a year-end estimate of 3.86. Lower than today’s 3.93 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 4.0 runs from 3.51 to 4.00. This rating sits in the top of the band, and every match moves it.

Our estimate, not a USTA figure.
i
scale measured at this point of 2023 on 2160 players. It moves when you play, and occasionally when we improve the model. USTA publishes year-end ratings in December, which is when this gets graded against what actually happened.
Where you rank
CA · 4.0
62 of 432
By our estimated rating, not the published level.
i
Debbie is ranked against players at the same level in the same place. The published level is identical for everyone in a band, so it cannot separate them — our estimate can. Groups smaller than five are not ranked at all, because a placing out of two is noise dressed as standing.
Over timerating by season, and how you rank
Rating by season

Debbie has played at 4.5, 4.0 across 6 seasons — 0 moves up and 1 down.

3.54.04.5201920222023202420252026

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 4.5, Debbie has gone from the 69th to the 6th percentile of players at that level, 2019 to 2024.

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 level4 levels played
0.0
2W–1L
not enough matches yet
4.0
58.8%
10W–7L · 59.3% of games
4.5
37.8%
17W–28L · 46% of games
8.0
62.5%
5W–3L · 61.3% of games

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

Match history78 matches
W
LINH LEE / Deann McCormick
2026-07-18 · #1 Doubles · 8.0 · with Cindi Carter
expectation pending — we're still fetching an opponent's record
7-5, 6-2
W
Franciz Bragg / Adrienne Beauvois
2026-07-11 · #1 Doubles · 4.0 · with Susan Yu
expectation pending — we're still fetching an opponent's record
6-3, 6-2
L
Elizabeth Rogers / Jeongyean Jang
2026-07-11 · #2 Doubles · 8.0 · with Melissa Mazin
expectation pending — we're still fetching an opponent's record
2-6, 6-3, 1-0
W
2026-06-28 · #1 Doubles · 4.0 · with Cindi Carter
+0.054better than expected — took 86% of games against 56% expected
6-2, 6-0
L
Sherri Murphy / Susan Jaeger
2026-05-29 · #1 Doubles · 4.0 · with Penapa Frick
expectation pending — we're still fetching an opponent's record
6-1, 6-1
W
Michele Ivey / Theresa Mistretta
2026-05-17 · #2 Doubles · 4.0 · with Lorna Kim
expectation pending — we're still fetching an opponent's record
7-5, 6-4
W
Ming-Ming Peng / Harmony Trax
2026-05-15 · #2 Doubles · 4.0 · with Katie Tong
expectation pending — we're still fetching an opponent's record
6-0, 6-2
W
Karen Beutler / Ellie Wei
2026-05-03 · #2 Doubles · 4.0 · with Nickie Huai
expectation pending — we're still fetching an opponent's record
6-3, 6-4
L
Maria Rose / Casondra Ruga
2026-05-01 · #1 Doubles · 4.0 · with Katie Tong
expectation pending — we're still fetching an opponent's record
6-7, 6-3, 1-0
L
2026-04-25 · #1 Doubles · 4.0 · with Monica Mitchell
expectation pending — we're still fetching an opponent's record
7-6, 6-7, 1-0
W
Alexandra Pichugina / Leslie Balta
2026-04-10 · #2 Doubles · 4.0 · with Katie Tong
expectation pending — we're still fetching an opponent's record
7-5, 6-3
L
Cynthia Tribull / Julie Blackwell
2026-04-03 · #1 Doubles · 4.0 · with Danielle Perrigue
expectation pending — we're still fetching an opponent's record
1-6, 6-4, 1-0
What an account addsprivate to you

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Not affiliated with or endorsed by the USTA. Rating shown is the published USTA year-end figure; match data is from USTA TennisLink.