H2H data updated: 2026-09-13 00:00 UTC
Bonnie Gadusek holds a 1–0 lead over Lori Kosten in their WTA head-to-head. Across 1 main-draw meeting, Bonnie Gadusek leads 1–0 on hard courts. Most recently, Bonnie Gadusek won the 1980 Sioux City round of 16 6-3 6-3.
Want to explore more matchups? Advanced rivalry search lets you browse current and historical rivalries, unbeaten records, or every matchup for a player.
| Player | Score | Player | Match Data | Date | Round | Tournament | Category | Surface |
|---|---|---|---|---|---|---|---|---|
| Bonnie Gadusek | 6-3 6-3 | Lori Kosten | Match data | Jul 13, 1980* | R16 | Sioux City | WTA 250 | Hard |
Estimated match date where the exact historical date is unavailable. Arrows show an edition's recorded category and documented modern equivalent; unresolved editions keep their recorded category. Asterisked totals include editions mapped from documented historical predecessor categories. Mapping details.
| Player | Current | Peak | Pts | Elo | W | L | Win % | GS | 1000 including documented historical predecessor categories | Finals | 500 including documented historical predecessor categories | 250 including documented historical predecessor categories | Titles |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bonnie Gadusek | — | #10 | — | 2,075 | 189 | 94 | 66.8% | 0 | 0 | 0 | 0 | 8 | 8 |
| Lori Kosten | — | — | — | 1,500 | 1 | 5 | 16.7% | 0 | 0 | 0 | 0 | 0 | 0 |
Seasons are aligned by the age each player spent most of that calendar year. GS and Titles are cumulative career totals through that season.
| Bonnie Gadusek | Lori Kosten | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | W-L | Win % | Rank | Elo | GS | Titles | Yr | W-L | Win % | Rank | Elo | GS | Titles |
| 1980 | 24–4 | 85.7% | — | 1,733 | 0 | 3 | 1980 | 1–4 | 20.0% | — | 1,472 | 0 | 0 |
| 1981 | 12–14 | 46.2% | — | 1,770 | 0 | 3 | 1983 | 0–1 | 0.0% | — | 1,463 | 0 | 0 |
| 1982 | 39–24 | 61.9% | — | 1,919 | 0 | 3 | — | — | — | — | — | — | — |
| 1983 | 24–15 | 61.5% | — | 1,932 | 0 | 3 | — | — | — | — | — | — | — |
| 1984 | 29–13 | 69.0% | — | 1,957 | 0 | 4 | — | — | — | — | — | — | — |
| 1985 | 45–12 | 78.9% | #10 | 2,047 | 0 | 8 | — | — | — | — | — | — | — |
| 1986 | 16–9 | 64.0% | — | 2,017 | 0 | 8 | — | — | — | — | — | — | — |
| 1987 | 0–3 | 0.0% | — | 1,934 | 0 | 8 | — | — | — | — | — | — | — |
Rows are aligned in career order because complete birth data is unavailable. Results cover completed main-draw matches. Bold green marks the higher win percentage when both players have at least 5 matches on that surface at the aligned age.
| Bonnie Gadusek | Lori Kosten | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | Hard | Clay | Grass | Carpet | Yr | Hard | Clay | Grass | Carpet | ||||||||||||||||||||||||
| W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | ||
| 1980 | 5 | 1 | 6 | 83.3% | — | — | — | — | — | — | — | — | — | — | — | — | 1980 | 1 | 2 | 3 | 33.3% | — | — | — | — | — | — | — | — | — | — | — | — |
| 1981 | 3 | 3 | 6 | 50.0% | 5 | 6 | 11 | 45.5% | 3 | 3 | 6 | 50.0% | 1 | 2 | 3 | 33.3% | 1983 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — |
| 1982 | 9 | 6 | 15 | 60.0% | 21 | 8 | 29 | 72.4% | — | — | — | — | 9 | 10 | 19 | 47.4% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1983 | 9 | 4 | 13 | 69.2% | 12 | 6 | 18 | 66.7% | — | — | — | — | 3 | 5 | 8 | 37.5% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1984 | 9 | 4 | 13 | 69.2% | 12 | 4 | 16 | 75.0% | — | — | — | — | 8 | 5 | 13 | 61.5% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1985 | 23 | 6 | 29 | 79.3% | 10 | 2 | 12 | 83.3% | 1 | 1 | 2 | 50.0% | 11 | 3 | 14 | 78.6% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1986 | 9 | 4 | 13 | 69.2% | 2 | 1 | 3 | 66.7% | — | — | — | — | 5 | 4 | 9 | 55.6% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1987 | 0 | 2 | 2 | 0.0% | — | — | — | — | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | 67 | 30 | 97 | 69.1% | 62 | 27 | 89 | 69.7% | 4 | 4 | 8 | 50.0% | 37 | 30 | 67 | 55.2% | Career | 1 | 3 | 4 | 25.0% | — | — | — | — | — | — | — | — | — | — | — | — |
Rows are aligned in career order because complete birth data is unavailable. Metrics use eligible main-draw results; point statistics use matches with detailed data. Bold green marks the stronger value when both underlying samples are sufficient. Lower is better for Schedule because a negative value means a tougher schedule. Career Schedule is normalized per 100 matches.
| Bonnie Gadusek | Lori Kosten | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | Elo | P+ | Serve+ | Return+ | PD | TPW% | Hard Elo | Clay Elo | Grass Elo | Set Win % | Set Margin | Dec. Set | Tiebreak | Pressure+ | Schedule | Yr | Elo | P+ | Serve+ | Return+ | PD | TPW% | Hard Elo | Clay Elo | Grass Elo | Set Win % | Set Margin | Dec. Set | Tiebreak | Pressure+ | Schedule |
| 1980 | 1734 | 141.9 | — | — | — | — | -68 | — | — | 88.9% | +3.20 | 2–2 (50%) | 1–1 | — | +1.58 | 1980 | 1473 | 100.3 | — | — | — | — | +70 | — | — | 20.0% | -1.20 | — | 0–2 | — | +0.11 |
| 1981 | 1771 | 135.3 | — | — | — | — | -50 | -196 | -118 | 48.3% | -0.18 | 3–5 (38%) | 0–3 (0%) | — | -2.37 | 1983 | 1463 | 90.6 | — | — | — | — | — | — | — | 0.0% | -5.50 | — | — | — | +0.02 |
| 1982 | 1920 | 156.9 | — | — | — | — | -95 | -3 | — | 60.0% | +0.84 | 6–4 (60%) | 4–7 (36%) | 102.5 | -5.48 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1983 | 1933 | 154.3 | — | — | — | — | -38 | +21 | — | 57.5% | +0.78 | 7–2 (78%) | 4–2 (67%) | 107.8 | -1.49 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1984 | 1957 | 154.7 | — | — | — | — | -38 | +73 | — | 63.7% | +0.77 | 7–2 (78%) | 5–0 (100%) | 109.4 | -2.12 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1985 | 2047 | 157.1 | — | — | — | — | -6 | +64 | — | 76.6% | +1.90 | 5–5 (50%) | 8–5 (62%) | 98.1 | +0.28 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1986 | 2018 | 152.4 | — | — | — | — | -24 | +105 | — | 59.6% | +0.67 | 5–2 (71%) | 1–4 (20%) | 99.6 | -2.20 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1987 | 1935 | 93.2 | — | — | — | — | -35 | — | — | 0.0% | -3.83 | — | — | — | +0.07 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | 2075 | 158.5 | — | — | — | — | -41 | +4 | -118 | 64.4% | +1.08 | 35–22 (61%) | 23–22 (51%) | 106.6 | -4.19 | Career | 1500 | 96.2 | — | — | — | — | +70 | — | — | 16.7% | -1.92 | — | 0–2 | — | +2.17 |
Each player's five most-played main-draw opponents. The current matchup is highlighted when it appears in a player's top five.
| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Chris Evert | 0 | 12 | 12 | Apr 5, 1986 | H2H |
| Manuela Maleeva Fragniere | 4 | 3 | 7 | Mar 17, 1986 | H2H |
| Pam Casale | 7 | 0 | 7 | Oct 13, 1985 | H2H |
| Virginia Ruzici | 2 | 5 | 7 | Jan 28, 1984 | H2H |
| Mima Jausovec | 3 | 3 | 6 | Feb 11, 1986 | H2H |
| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Nancy Yeargin | 0 | 1 | 1 | Mar 3, 1983 | H2H |
| Bonnie Gadusek | 0 | 1 | 1 | Jul 13, 1980 | H2H |
| Helen Park | 0 | 1 | 1 | Jul 4, 1980 | H2H |
| Cathy Fink | 1 | 0 | 1 | Jul 3, 1980 | H2H |
| Sonoe Yonezawa | 0 | 1 | 1 | Jun 26, 1980 | H2H |