H2H data updated: 2026-09-07 00:00 UTC
Wojtek Kowalski holds a 1–0 lead over Frederik Fetterlein in their ATP head-to-head. Across 1 main-draw meeting, Wojtek Kowalski leads 1–0 on clay. Most recently, Wojtek Kowalski won the 1995 Croatia Open Umag round of 32 6-4 6-2.
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| Player | Score | Player | Match Data | Date | Round | Tournament | Category | Surface |
|---|---|---|---|---|---|---|---|---|
| Wojtek Kowalski | 6-4 6-2 | Frederik Fetterlein | Match data | Aug 24, 1995* | R32 | Croatia Open Umag | ATP World Series → modern equivalent ATP 250 | Clay |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frederik Fetterlein | #1,381 | #75 | 588 | 1,589 | 26 | 49 | 34.7% | 0 | 0 | 0 | 0 | 0 | 0 |
| Wojtek Kowalski | #1,360 | #109 | 316 | 1,527 | 6 | 13 | 31.6% | 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.
| Age | Frederik Fetterlein | Wojtek Kowalski | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | W-L | Win % | Rank | Elo | GS | Titles | Yr | W-L | Win % | Rank | Elo | GS | Titles | |
| 20 | 1991 | 1–1 | 50.0% | #417 | 1,518 | 0 | 0 | 1988 | 1–3 | 25.0% | #198 | 1,480 | 0 | 0 |
| 21 | 1992 | 1–4 | 20.0% | #270 | 1,500 | 0 | 0 | — | — | — | — | — | — | — |
| 22 | 1993 | 0–2 | 0.0% | #571 | 1,489 | 0 | 0 | — | — | — | — | — | — | — |
| 23 | 1994 | 0–1 | 0.0% | #143 | 1,478 | 0 | 0 | 1991 | 1–2 | 33.3% | #328 | 1,478 | 0 | 0 |
| 24 | 1995 | 10–12 | 45.5% | #99 | 1,566 | 0 | 0 | — | — | — | — | — | — | — |
| 25 | 1996 | 7–19 | 26.9% | #167 | 1,508 | 0 | 0 | — | — | — | — | — | — | — |
| 26 | 1997 | 6–8 | 42.9% | #135 | 1,549 | 0 | 0 | — | — | — | — | — | — | — |
| 27 | 1998 | 0–1 | 0.0% | #667 | 1,535 | 0 | 0 | 1995 | 1–5 | 16.7% | #157 | 1,460 | 0 | 0 |
| 28 | 1999 | 1–1 | 50.0% | #548 | 1,545 | 0 | 0 | 1996 | 3–3 | 50.0% | #270 | 1,504 | 0 | 0 |
Seasons are aligned by the age each player spent most of that calendar year. 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.
| Age | Frederik Fetterlein | Wojtek Kowalski | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 % | |||
| 20 | 1991 | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 2 | 50.0% | 1988 | 0 | 2 | 2 | 0.0% | 1 | 1 | 2 | 50.0% | — | — | — | — | — | — | — | — |
| 21 | 1992 | — | — | — | — | 1 | 3 | 4 | 25.0% | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 22 | 1993 | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 23 | 1994 | — | — | — | — | — | — | — | — | — | — | — | — | 0 | 1 | 1 | 0.0% | 1991 | — | — | — | — | 1 | 2 | 3 | 33.3% | — | — | — | — | — | — | — | — |
| 24 | 1995 | 3 | 2 | 5 | 60.0% | 4 | 6 | 10 | 40.0% | 1 | 2 | 3 | 33.3% | 2 | 2 | 4 | 50.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 25 | 1996 | 5 | 7 | 12 | 41.7% | 0 | 6 | 6 | 0.0% | 2 | 2 | 4 | 50.0% | 0 | 4 | 4 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 26 | 1997 | 1 | 2 | 3 | 33.3% | 2 | 3 | 5 | 40.0% | 1 | 1 | 2 | 50.0% | 2 | 2 | 4 | 50.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 27 | 1998 | — | — | — | — | — | — | — | — | — | — | — | — | 0 | 1 | 1 | 0.0% | 1995 | 0 | 1 | 1 | 0.0% | 1 | 3 | 4 | 25.0% | — | — | — | — | 0 | 1 | 1 | 0.0% |
| 28 | 1999 | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 2 | 50.0% | 1996 | 2 | 2 | 4 | 50.0% | 1 | 1 | 2 | 50.0% | — | — | — | — | — | — | — | — |
| Career | — | 9 | 11 | 20 | 45.0% | 7 | 19 | 26 | 26.9% | 4 | 5 | 9 | 44.4% | 6 | 14 | 20 | 30.0% | — | 2 | 5 | 7 | 28.6% | 4 | 7 | 11 | 36.4% | — | — | — | — | 0 | 1 | 1 | 0.0% |
Seasons are aligned by the age each player spent most of that calendar year. Detailed serve and return statistics available for 61/75 of Frederik Fetterlein's and 13/15 of Wojtek Kowalski's main draw matches. Sample is shown as matches with detailed serve and return statistics / total main draw matches. Bold green marks the stronger value when both stat samples contain at least 5 matches; lower is better for DFs/M.
| Age | Frederik Fetterlein | Wojtek Kowalski | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | Sample | Aces/M | DFs/M | 1st Sv% | 1st Pts% | 2nd Pts% | BP Saved% | BP Conv% | Svc Pts% | Ret Pts% | Yr | Sample | Aces/M | DFs/M | 1st Sv% | 1st Pts% | 2nd Pts% | BP Saved% | BP Conv% | Svc Pts% | Ret Pts% | |
| 20 | 1991 | 2/2 | 1.5 | 3.5 | 53.2% | 76.2% | 51.2% | 55.0% | 52.9% | 63.9% | 40.5% | — | —/— | — | — | — | — | — | — | — | — | — |
| 21 | 1992 | 3/5 | 2.7 | 5.0 | 57.2% | 51.9% | 46.1% | 36.2% | 48.2% | 48.8% | 46.1% | — | —/— | — | — | — | — | — | — | — | — | — |
| 22 | 1993 | 2/2 | 2.5 | 9.0 | 51.4% | 73.1% | 33.9% | 52.1% | 50.0% | 53.8% | 31.5% | — | —/— | — | — | — | — | — | — | — | — | — |
| 23 | 1994 | 1/1 | 7.0 | 8.0 | 55.2% | 81.1% | 36.7% | 62.5% | 16.7% | 61.2% | 32.4% | 1991 | 2/3 | 5.5 | 2.5 | 53.8% | 69.8% | 39.6% | 53.0% | 13.6% | 55.6% | 34.0% |
| 24 | 1995 | 17/22 | 5.5 | 5.9 | 60.9% | 69.8% | 43.3% | 47.5% | 46.6% | 59.5% | 40.0% | — | —/— | — | — | — | — | — | — | — | — | — |
| 25 | 1996 | 20/26 | 3.4 | 5.6 | 58.3% | 64.7% | 37.2% | 44.4% | 35.4% | 53.1% | 35.2% | — | —/— | — | — | — | — | — | — | — | — | — |
| 26 | 1997 | 13/14 | 7.0 | 5.2 | 58.8% | 71.1% | 46.3% | 64.8% | 41.2% | 61.0% | 34.9% | — | —/— | — | — | — | — | — | — | — | — | — |
| 27 | 1998 | 1/1 | 13.0 | 5.0 | 48.9% | 71.1% | 63.8% | 75.0% | 100.0% | 67.4% | 32.0% | 1995 | 6/6 | 4.5 | 2.7 | 57.2% | 69.3% | 47.8% | 47.8% | 36.0% | 59.7% | 36.9% |
| 28 | 1999 | 2/2 | 6.5 | 6.5 | 51.5% | 79.6% | 42.3% | 71.4% | 71.4% | 61.3% | 32.0% | 1996 | 5/6 | 8.8 | 1.6 | 55.7% | 62.7% | 51.4% | 58.8% | 36.0% | 57.8% | 34.9% |
| Career | — | 61/75 | 4.9 | 5.7 | 58.3% | 68.4% | 42.2% | 51.5% | 43.4% | 57.4% | 36.9% | — | 13/19 | 6.3 | 2.2 | 56.1% | 66.8% | 47.9% | 52.8% | 32.6% | 58.4% | 35.7% |
Seasons are aligned by the age each player spent most of that calendar year. 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.
| Age | Frederik Fetterlein | Wojtek Kowalski | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | |
| 20 | 1991 | 1518 | 108.8 | +1.44 | -2.59 | 1.121 | 52.0% | — | — | — | 50.0% | +0.17 | 1–1 | — | — | -0.08 | 1988 | 1480 | 100.1 | — | — | — | — | — | — | — | 18.2% | -1.55 | 1–1 | — | — | +0.08 |
| 21 | 1992 | 1501 | 99.8 | -3.31 | -0.08 | 0.902 | 47.3% | — | +22 | — | 33.3% | -1.75 | 0–2 | 1–0 | — | +0.12 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 22 | 1993 | 1489 | 109.5 | +1.48 | +1.70 | 0.681 | 43.3% | — | — | — | 20.0% | -2.20 | 0–1 | 0–1 | — | -0.15 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 23 | 1994 | 1479 | 100.7 | +2.21 | -1.57 | 0.836 | 46.1% | — | — | — | 0.0% | -2.50 | — | 0–1 | — | +0.06 | 1991 | 1478 | 104.4 | +1.63 | -1.28 | 0.767 | 44.0% | — | +76 | — | 42.9% | -1.00 | 0–1 | — | — | +0.16 |
| 24 | 1995 | 1567 | 119.3 | -0.12 | +0.16 | 0.988 | 49.7% | +2 | -29 | +4 | 45.0% | -0.23 | 4–2 (67%) | 6–5 (55%) | 105.1 | +0.92 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 25 | 1996 | 1509 | 122.8 | -6.28 | -1.14 | 0.751 | 44.5% | +77 | -51 | +95 | 29.9% | -1.33 | 5–5 (50%) | 5–2 (71%) | 104.0 | -0.11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 26 | 1997 | 1549 | 119.4 | -0.77 | -1.18 | 0.894 | 47.9% | +42 | -48 | — | 42.1% | -0.71 | 3–2 (60%) | 3–2 (60%) | 103.4 | +0.14 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 27 | 1998 | 1535 | 101.2 | -1.53 | -2.37 | 0.980 | 49.2% | — | — | — | 33.3% | -0.67 | 0–1 | 0–1 | — | +0.10 | 1995 | 1460 | 117.0 | +0.24 | -0.41 | 0.916 | 47.8% | — | +64 | — | 31.3% | -0.69 | 0–2 | 1–1 | — | -0.05 |
| 28 | 1999 | 1545 | 105.8 | -0.51 | -0.47 | 0.829 | 48.7% | — | — | — | 50.0% | +0.25 | — | — | — | +0.09 | 1996 | 1505 | 107.3 | -1.02 | -0.98 | 0.827 | 46.8% | +10 | — | — | 46.7% | -0.46 | 2–1 (67%) | 1–1 | — | +0.03 |
| Career | — | 1589 | 123.2 | -2.33 | -0.69 | 0.865 | 47.3% | +48 | -30 | +56 | 37.6% | -0.85 | 13–14 (48%) | 15–12 (56%) | 105.0 | +1.45 | — | 1527 | 111.5 | -0.03 | -0.76 | 0.857 | 46.8% | +10 | +69 | — | 34.7% | -0.86 | 3–5 (38%) | 2–2 (50%) | 99.9 | +1.16 |
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 |
|---|---|---|---|---|---|
| David Prinosil | 1 | 2 | 3 | Mar 4, 1999 | H2H |
| Martin Damm Sr | 1 | 2 | 3 | Mar 15, 1997 | — |
| Thomas Muster | 1 | 2 | 3 | May 29, 1996 | H2H |
| Olivier Delaitre | 0 | 2 | 2 | Mar 12, 1998 | H2H |
| Brett Steven | 0 | 2 | 2 | Jul 30, 1997 | H2H |
| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Thomas Muster | 0 | 1 | 1 | Aug 8, 1996 | H2H |
| Nicklas Kulti | 1 | 0 | 1 | Aug 7, 1996 | H2H |
| Sjeng Schalken | 0 | 1 | 1 | Jul 25, 1996 | H2H |
| Joao Cunha Silva | 1 | 0 | 1 | Jul 24, 1996 | — |
| MaliVai Washington | 0 | 1 | 1 | Mar 20, 1996 | H2H |