H2H data updated: 2026-09-14 00:00 UTC
Patricia Hy Boulais holds a 3–2 lead over Kimberly Po Messerli in their WTA head-to-head. Across 5 main-draw meetings, Patricia Hy Boulais leads 2–1 on hard courts, while Kimberly Po Messerli leads 1–0 on clay. Most recently, Kimberly Po Messerli won the 1998 Madrid Open round of 32 2-6 6-4 6-1.
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 |
|---|---|---|---|---|---|---|---|---|
| Kimberly Po Messerli | 2-6 6-4 6-1 | Patricia Hy Boulais | Match data | May 21, 1998* | R32 | Madrid Open | Tier III → modern equivalent WTA 250 | Clay |
| Patricia Hy Boulais | 7-5 6-0 | Kimberly Po Messerli | Match data | Aug 12, 1994* | R16 | Manhattan Beach | Tier II → modern equivalent WTA 500 | Hard |
| Kimberly Po Messerli | 6-4 6-2 | Patricia Hy Boulais | Match data | Jan 22, 1993* | R64 | Australian Open | Grand Slam | Hard |
| Patricia Hy Boulais | 6-4 2-6 6-2 | Kimberly Po Messerli | Match data | Jan 14, 1993* | R32 | Melbourne | Tier IV → modern equivalent WTA 250 | Hard |
| Patricia Hy Boulais | 6-2 6-3 | Kimberly Po Messerli | Match data | Jun 18, 1992* | R32 | Eastbourne Open | Tier II → modern equivalent WTA 500 | Grass |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Patricia Hy Boulais | — | — | — | 1,906 | 142 | 165 | 46.3% | 0 | 0 | 0 | 0 | 1 | 1 |
| Kimberly Po Messerli | — | — | — | 1,879 | 118 | 133 | 47.0% | 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 | Patricia Hy Boulais | Kimberly Po Messerli | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | W-L | Win % | Rank | Elo | GS | Titles | Yr | W-L | Win % | Rank | Elo | GS | Titles | |
| 15 | 1981 | 0–1 | 0.0% | — | 1,493 | 0 | 0 | — | — | — | — | — | — | — |
| 16 | 1982 | 0–1 | 0.0% | — | 1,477 | 0 | 0 | — | — | — | — | — | — | — |
| 17 | 1983 | 7–8 | 46.7% | — | 1,546 | 0 | 0 | 1989 | 0–1 | 0.0% | — | 1,486 | 0 | 0 |
| 18 | 1984 | 0–2 | 0.0% | — | 1,522 | 0 | 0 | — | — | — | — | — | — | — |
| 19 | — | — | — | — | — | — | — | 1991 | 5–4 | 55.6% | — | 1,568 | 0 | 0 |
| 20 | 1986 | 8–1 | 88.9% | — | 1,633 | 0 | 1 | 1992 | 14–16 | 46.7% | — | 1,654 | 0 | 0 |
| 21 | 1987 | 9–15 | 37.5% | — | 1,594 | 0 | 1 | 1993 | 20–19 | 51.3% | — | 1,776 | 0 | 0 |
| 22 | 1988 | 0–5 | 0.0% | — | 1,548 | 0 | 1 | 1994 | 11–17 | 39.3% | — | 1,701 | 0 | 0 |
| 23 | 1989 | 1–4 | 20.0% | — | 1,514 | 0 | 1 | 1995 | 4–13 | 23.5% | — | 1,609 | 0 | 0 |
| 24 | 1990 | 7–7 | 50.0% | — | 1,573 | 0 | 1 | 1996 | 20–13 | 60.6% | — | 1,806 | 0 | 0 |
| 25 | 1991 | 18–17 | 51.4% | — | 1,704 | 0 | 1 | 1997 | 27–20 | 57.4% | — | 1,790 | 0 | 0 |
| 26 | 1992 | 22–16 | 57.9% | — | 1,876 | 0 | 1 | 1998 | 11–15 | 42.3% | — | 1,743 | 0 | 0 |
| 27 | 1993 | 21–15 | 58.3% | — | 1,851 | 0 | 1 | 1999 | 6–13 | 31.6% | — | 1,653 | 0 | 0 |
| 28 | 1994 | 15–16 | 48.4% | — | 1,756 | 0 | 1 | 2000 | 0–2 | 0.0% | — | 1,611 | 0 | 0 |
| 29 | 1995 | 11–14 | 44.0% | — | 1,691 | 0 | 1 | — | — | — | — | — | — | — |
| 30 | 1996 | 10–16 | 38.5% | — | 1,687 | 0 | 1 | — | — | — | — | — | — | — |
| 31 | 1997 | 12–19 | 38.7% | — | 1,663 | 0 | 1 | — | — | — | — | — | — | — |
| 32 | 1998 | 1–8 | 11.1% | — | 1,573 | 0 | 1 | — | — | — | — | — | — | — |
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 | Patricia Hy Boulais | Kimberly Po Messerli | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 % | |||
| 15 | 1981 | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 16 | 1982 | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 17 | 1983 | 5 | 3 | 8 | 62.5% | 0 | 1 | 1 | 0.0% | 2 | 2 | 4 | 50.0% | 0 | 2 | 2 | 0.0% | 1989 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — |
| 18 | 1984 | 0 | 1 | 1 | 0.0% | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 19 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1991 | 5 | 4 | 9 | 55.6% | — | — | — | — | — | — | — | — | — | — | — | — |
| 20 | 1986 | 3 | 1 | 4 | 75.0% | — | — | — | — | — | — | — | — | 5 | 0 | 5 | 100.0% | 1992 | 9 | 10 | 19 | 47.4% | 0 | 1 | 1 | 0.0% | 4 | 3 | 7 | 57.1% | 1 | 2 | 3 | 33.3% |
| 21 | 1987 | 5 | 6 | 11 | 45.5% | 0 | 2 | 2 | 0.0% | 3 | 5 | 8 | 37.5% | 1 | 2 | 3 | 33.3% | 1993 | 10 | 9 | 19 | 52.6% | 2 | 2 | 4 | 50.0% | 2 | 3 | 5 | 40.0% | 6 | 5 | 11 | 54.5% |
| 22 | 1988 | 0 | 3 | 3 | 0.0% | — | — | — | — | 0 | 1 | 1 | 0.0% | 0 | 1 | 1 | 0.0% | 1994 | 3 | 6 | 9 | 33.3% | 2 | 4 | 6 | 33.3% | 1 | 2 | 3 | 33.3% | 5 | 5 | 10 | 50.0% |
| 23 | 1989 | 1 | 4 | 5 | 20.0% | — | — | — | — | — | — | — | — | — | — | — | — | 1995 | 3 | 4 | 7 | 42.9% | 0 | 5 | 5 | 0.0% | 0 | 2 | 2 | 0.0% | 1 | 2 | 3 | 33.3% |
| 24 | 1990 | 6 | 5 | 11 | 54.5% | 0 | 1 | 1 | 0.0% | 1 | 1 | 2 | 50.0% | — | — | — | — | 1996 | 13 | 6 | 19 | 68.4% | — | — | — | — | 1 | 2 | 3 | 33.3% | 6 | 5 | 11 | 54.5% |
| 25 | 1991 | 13 | 11 | 24 | 54.2% | 1 | 3 | 4 | 25.0% | 4 | 2 | 6 | 66.7% | 0 | 1 | 1 | 0.0% | 1997 | 21 | 13 | 34 | 61.8% | 2 | 2 | 4 | 50.0% | 1 | 2 | 3 | 33.3% | 3 | 3 | 6 | 50.0% |
| 26 | 1992 | 8 | 5 | 13 | 61.5% | 10 | 6 | 16 | 62.5% | 4 | 2 | 6 | 66.7% | 0 | 3 | 3 | 0.0% | 1998 | 5 | 8 | 13 | 38.5% | 1 | 3 | 4 | 25.0% | 4 | 2 | 6 | 66.7% | 1 | 2 | 3 | 33.3% |
| 27 | 1993 | 10 | 9 | 19 | 52.6% | 4 | 3 | 7 | 57.1% | 4 | 2 | 6 | 66.7% | 3 | 1 | 4 | 75.0% | 1999 | 3 | 6 | 9 | 33.3% | 1 | 3 | 4 | 25.0% | 2 | 2 | 4 | 50.0% | 0 | 2 | 2 | 0.0% |
| 28 | 1994 | 11 | 9 | 20 | 55.0% | 1 | 3 | 4 | 25.0% | 0 | 2 | 2 | 0.0% | 3 | 2 | 5 | 60.0% | 2000 | — | — | — | — | — | — | — | — | 0 | 1 | 1 | 0.0% | 0 | 1 | 1 | 0.0% |
| 29 | 1995 | 5 | 8 | 13 | 38.5% | 5 | 4 | 9 | 55.6% | 1 | 1 | 2 | 50.0% | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 30 | 1996 | 1 | 7 | 8 | 12.5% | 4 | 4 | 8 | 50.0% | 3 | 2 | 5 | 60.0% | 2 | 3 | 5 | 40.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 31 | 1997 | 4 | 10 | 14 | 28.6% | 3 | 5 | 8 | 37.5% | 4 | 2 | 6 | 66.7% | 1 | 2 | 3 | 33.3% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 32 | 1998 | 0 | 3 | 3 | 0.0% | 0 | 4 | 4 | 0.0% | 1 | 1 | 2 | 50.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | — | 72 | 85 | 157 | 45.9% | 28 | 39 | 67 | 41.8% | 27 | 23 | 50 | 54.0% | 15 | 18 | 33 | 45.5% | — | 72 | 67 | 139 | 51.8% | 8 | 20 | 28 | 28.6% | 15 | 19 | 34 | 44.1% | 23 | 27 | 50 | 46.0% |
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 | Patricia Hy Boulais | Kimberly Po Messerli | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | |
| 15 | 1981 | 1493 | 98.1 | — | — | — | — | — | — | — | 0.0% | -4.00 | — | — | — | -0.07 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 16 | 1982 | 1477 | 98.2 | — | — | — | — | — | — | — | 0.0% | -2.00 | — | — | — | +0.18 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 17 | 1983 | 1546 | 117.5 | — | — | — | — | +51 | — | +83 | 46.9% | +0.12 | 1–1 | 1–1 | — | +0.93 | 1989 | 1486 | 97.5 | — | — | — | — | — | — | — | 0.0% | -2.50 | — | 0–1 | — | +0.12 |
| 18 | 1984 | 1523 | 101.3 | — | — | — | — | — | — | — | 33.3% | -0.67 | 0–2 | 0–1 | — | +0.06 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 19 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1991 | 1568 | 120.4 | — | — | — | — | +29 | — | — | 56.5% | -0.26 | 2–3 (40%) | 1–0 | — | -0.01 |
| 20 | 1986 | 1633 | 110.5 | — | — | — | — | +41 | — | — | 69.6% | +1.65 | 5–0 (100%) | 1–2 (33%) | — | +2.61 | 1992 | 1655 | 127.7 | — | — | — | — | -8 | — | -30 | 45.6% | -0.40 | 5–5 (50%) | 4–2 (67%) | 103.5 | +0.99 |
| 21 | 1987 | 1595 | 115.4 | — | — | — | — | +48 | — | +10 | 37.5% | -0.93 | 5–3 (63%) | 1–6 (14%) | 97.9 | -0.17 | 1993 | 1777 | 145.0 | — | — | — | — | +17 | -217 | -153 | 50.0% | -0.15 | 6–4 (60%) | 5–2 (71%) | 106.5 | -0.91 |
| 22 | 1988 | 1548 | 99.0 | — | — | — | — | +29 | — | — | 0.0% | -3.00 | — | 0–2 | — | -0.27 | 1994 | 1702 | 128.7 | — | — | — | — | +38 | -143 | -106 | 44.6% | -0.51 | 4–7 (36%) | 2–2 (50%) | — | -0.08 |
| 23 | 1989 | 1515 | 91.9 | — | — | — | — | +9 | — | — | 20.0% | -2.30 | — | — | — | +0.31 | 1995 | 1610 | 120.0 | — | — | — | — | +98 | -130 | — | 29.7% | -1.11 | 0–3 (0%) | 1–3 (25%) | 93.6 | +0.25 |
| 24 | 1990 | 1574 | 118.5 | — | — | — | — | +7 | — | — | 51.7% | +0.41 | 2–1 (67%) | 1–2 (33%) | — | +0.67 | 1996 | 1807 | 155.2 | — | — | — | — | +52 | — | -239 | 57.5% | +0.44 | 5–4 (56%) | 1–1 | — | +0.41 |
| 25 | 1991 | 1704 | 141.1 | — | — | — | — | -20 | -265 | +2 | 50.0% | +0.11 | 6–4 (60%) | 2–1 (67%) | 104.8 | -0.45 | 1997 | 1790 | 146.8 | — | — | — | — | +28 | -289 | -240 | 55.0% | +0.44 | 9–8 (53%) | 7–2 (78%) | 103.7 | +1.04 |
| 26 | 1992 | 1877 | 155.6 | — | — | — | — | -71 | -231 | -109 | 56.3% | +0.35 | 7–3 (70%) | 2–2 (50%) | 107.4 | -1.82 | 1998 | 1743 | 135.6 | — | — | — | — | +16 | -267 | -100 | 44.8% | -0.59 | 2–4 (33%) | 4–1 (80%) | 102.7 | -0.85 |
| 27 | 1993 | 1852 | 141.8 | — | — | — | — | -46 | -170 | +3 | 57.0% | +0.38 | 6–3 (67%) | 4–3 (57%) | 105.0 | -1.32 | 1999 | 1653 | 120.4 | — | — | — | — | +21 | -179 | -26 | 38.1% | -1.00 | 0–4 (0%) | 1–4 (20%) | 93.6 | -1.39 |
| 28 | 1994 | 1756 | 132.7 | — | — | — | — | +24 | -99 | — | 52.4% | +0.25 | 2–3 (40%) | 3–1 (75%) | 99.3 | -0.60 | 2000 | 1611 | 101.2 | — | — | — | — | — | — | — | 20.0% | -1.00 | 0–1 | 0–2 | — | +0.12 |
| 29 | 1995 | 1691 | 125.6 | — | — | — | — | +15 | -27 | — | 50.0% | -0.18 | 3–9 (25%) | 3–2 (60%) | 93.7 | +0.06 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 30 | 1996 | 1687 | 132.9 | — | — | — | — | -41 | -41 | +161 | 40.0% | -0.73 | 4–4 (50%) | 1–4 (20%) | 98.0 | -1.41 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 31 | 1997 | 1664 | 129.6 | — | — | — | — | -71 | +1 | +194 | 40.3% | -0.58 | 8–7 (53%) | 2–5 (29%) | 99.0 | -0.88 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 32 | 1998 | 1574 | 92.9 | — | — | — | — | -25 | -9 | — | 26.1% | -2.00 | 1–4 (20%) | 1–1 | — | -0.04 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | — | 1906 | 138.1 | — | — | — | — | -10 | -116 | +43 | 47.1% | -0.18 | 50–44 (53%) | 22–33 (40%) | 98.3 | -0.72 | — | 1880 | 144.9 | — | — | — | — | +29 | -197 | -111 | 47.9% | -0.22 | 33–43 (43%) | 26–20 (57%) | 102.5 | -0.12 |
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 |
|---|---|---|---|---|---|
| Jana Novotna | 1 | 9 | 10 | Jul 3, 1996 | H2H |
| Gabriela Sabatini | 0 | 7 | 7 | Aug 28, 1996 | H2H |
| Kimberly Po Messerli | 3 | 2 | 5 | May 21, 1998 | H2H |
| Helena Sukova | 3 | 2 | 5 | May 22, 1997 | H2H |
| Mary Joe Fernandez | 0 | 5 | 5 | Apr 10, 1997 | H2H |
| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Lindsay Davenport | 1 | 6 | 7 | Nov 13, 1998 | H2H |
| Nathalie Tauziat | 3 | 4 | 7 | Oct 8, 1998 | H2H |
| Anke Huber | 2 | 3 | 5 | Oct 21, 1999 | H2H |
| Barbara Schett | 1 | 4 | 5 | May 27, 1999 | H2H |
| Patricia Hy Boulais | 2 | 3 | 5 | May 21, 1998 | H2H |