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James Halberg

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Sun Prairie, WI
3.5C year-end 2025
i
Computer — generated by the USTA algorithm from match play
41 matches · 17W–24L · seasons 2019–2025
Match history41 matches
L
2025-07-31 · WI Adult 55&O 7.0M MALT Wagner · #2 Doubles · 7.0 · with Stephen Meyer
no estimate for this season
i
Our model did not follow this player through that season: none of their matches that season carried an individual NTRP level (55 & Over and combo leagues are rated on combined levels), so it had nothing to start from. The match still counts toward the USTA rating.
4-6, 0-2
W
2025-07-17 · WI Adult 55&O 7.0M MALT Wagner · #1 Doubles · 7.0 · with Kevin McAllister
no estimate for this season
i
Our model did not follow this player through that season: none of their matches that season carried an individual NTRP level (55 & Over and combo leagues are rated on combined levels), so it had nothing to start from. The match still counts toward the USTA rating.
6-2, 6-2
W
2025-07-10 · WI Adult 55&O 7.0M MALT Wagner · #1 Doubles · 7.0 · with Karl Nissler
no estimate for this season
i
Our model did not follow this player through that season: none of their matches that season carried an individual NTRP level (55 & Over and combo leagues are rated on combined levels), so it had nothing to start from. The match still counts toward the USTA rating.
6-2, 6-1
W
2025-06-19 · WI Adult 55&O 7.0M MALT Wagner · #2 Doubles · 7.0 · with Karl Nissler
no estimate for this season
i
Our model did not follow this player through that season: none of their matches that season carried an individual NTRP level (55 & Over and combo leagues are rated on combined levels), so it had nothing to start from. The match still counts toward the USTA rating.
6-0, 6-3
W
2024-07-20 · WI Adult 55&O 7.0M MALT Bround · #2 Doubles · 7.0 · with Frank Hilscher
no estimate for this season
i
Our model did not follow this player through that season: none of their matches that season carried an individual NTRP level (55 & Over and combo leagues are rated on combined levels), so it had nothing to start from. The match still counts toward the USTA rating.
6-2, 6-1
L
2024-06-29 · WI Adult 55&O 7.0M MALT Bround · #1 Doubles · 7.0 · with Timothy O'Donnell
no estimate for this season
i
Our model did not follow this player through that season: none of their matches that season carried an individual NTRP level (55 & Over and combo leagues are rated on combined levels), so it had nothing to start from. The match still counts toward the USTA rating.
2-6, 4-6
W
2024-06-22 · WI Adult 55&O 7.0M MALT Bround · #3 Doubles · 7.0 · with Timothy O'Donnell
no estimate for this season
i
Our model did not follow this player through that season: none of their matches that season carried an individual NTRP level (55 & Over and combo leagues are rated on combined levels), so it had nothing to start from. The match still counts toward the USTA rating.
6-3, 6-2
W
2024-05-18 · WI Adult 55&O 7.0M MALT Bround · #1 Doubles · 7.0 · with Timothy O'Donnell
no estimate for this season
i
Our model did not follow this player through that season: none of their matches that season carried an individual NTRP level (55 & Over and combo leagues are rated on combined levels), so it had nothing to start from. The match still counts toward the USTA rating.
7-5, 6-2
L
2023-07-22 · WI Adult 55&Over 7.0M MALT Bround · #1 Doubles · 7.0 · with Karl Nissler
no estimate for this season
i
Our model did not follow this player through that season: none of their matches that season carried an individual NTRP level (55 & Over and combo leagues are rated on combined levels), so it had nothing to start from. The match still counts toward the USTA rating.
1-6, 4-6
L
2023-07-15 · WI Adult 55&Over 7.0M MALT Bround · #1 Doubles · 7.0 · with Karl Nissler
no estimate for this season
i
Our model did not follow this player through that season: none of their matches that season carried an individual NTRP level (55 & Over and combo leagues are rated on combined levels), so it had nothing to start from. The match still counts toward the USTA rating.
1-6, 4-6
W
2023-06-17 · WI Adult 55&Over 7.0M MALT Bround · #2 Doubles · 7.0 · with Karl Nissler
no estimate for this season
i
Our model did not follow this player through that season: none of their matches that season carried an individual NTRP level (55 & Over and combo leagues are rated on combined levels), so it had nothing to start from. The match still counts toward the USTA rating.
2-6, 7-5, 1-0
L
Bob Liebman / Michael Kelly
2022-08-26 · WI Adult 65 & over 8.0 MALT Crump · #2 Doubles · 8.0 · with Sid Ballweg
loading the estimate
2-10
Where you rank locallyagainst everyone at your level
Teams11 teams · 2019–2025
Over timerating by season, and how you rank
By level2 levels played
7.0
73.7%
14W–5L · 59.6% of games
8.0
13.6%
3W–19L · 33.9% of games

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

By lineusually #2 Doubles, 39% of the time
#2 Doubles
39%
16 matches
#1 Doubles
32%
13 matches
#3 Doubles
29%
12 matches

How often, across every team and every match we hold — including ones that do not count toward a rating. Advanced stats has a court-position table too, and it answers a different question: how well you do there, over matches that count. A team’s own page shows how that one team uses you.

Not affiliated with or endorsed by the USTA. Ratings labelled as published are USTA year-end figures; anything we describe as an estimate is ours, not USTA’s. Match data is from USTA TennisLink.

The moment of victory is much too short to live for that and nothing else.
Martina Navratilova