H2H data updated: 2026-09-12 00:00 UTC
Stephanie Defina holds a 2–1 lead over Mona Guerrant in their WTA head-to-head. Across 3 main-draw meetings, Stephanie Defina leads 2–0 on clay, while Mona Guerrant leads 1–0 on carpet. Most recently, Mona Guerrant won the 1974 Denver round of 32 7-6 6-4.
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 |
|---|---|---|---|---|---|---|---|---|
| Mona Guerrant | 7-6 6-4 | Stephanie Defina | Match data | Sep 26, 1974* | R32 | Denver | WTA 250 | Carpet |
| Stephanie Defina | 6-4 3-6 6-2 | Mona Guerrant | Match data | Apr 9, 1970* | R32 | St. Petersburg | WTA 500 | Clay |
| Stephanie Defina | 6-2 6-1 | Mona Guerrant | Match data | Jan 18, 1970* | F | Orlando | WTA 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mona Guerrant | — | — | — | 1,941 | 122 | 116 | 51.3% | 0 | 0 | 0 | 0 | 3 | 3 |
| Stephanie Defina | — | — | — | 1,818 | 93 | 62 | 60.0% | 0 | 0 | 0 | 0 | 7 | 7 |
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 | Mona Guerrant | Stephanie Defina | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | W-L | Win % | Rank | Elo | GS | Titles | Yr | W-L | Win % | Rank | Elo | GS | Titles | |
| 20 | 1969 | 1–1 | 50.0% | — | 1,500 | 0 | 0 | — | — | — | — | — | — | — |
| 21 | 1970 | 1–2 | 33.3% | — | 1,504 | 0 | 0 | — | — | — | — | — | — | — |
| 22 | 1971 | 3–8 | 27.3% | — | 1,517 | 0 | 0 | 1968 | 33–22 | 60.0% | — | 1,678 | 0 | 1 |
| 23 | 1972 | 28–22 | 56.0% | — | 1,733 | 0 | 1 | 1969 | 25–9 | 73.5% | — | 1,760 | 0 | 5 |
| 24 | 1973 | 17–19 | 47.2% | — | 1,780 | 0 | 2 | 1970 | 33–17 | 66.0% | — | 1,788 | 0 | 7 |
| 25 | 1974 | 12–14 | 46.2% | — | 1,779 | 0 | 2 | 1971 | 1–9 | 10.0% | — | 1,706 | 0 | 7 |
| 26 | 1975 | 12–12 | 50.0% | — | 1,905 | 0 | 2 | 1972 | 1–2 | 33.3% | — | 1,713 | 0 | 7 |
| 27 | 1976 | 15–14 | 51.7% | — | 1,898 | 0 | 2 | 1973 | 0–2 | 0.0% | — | 1,685 | 0 | 7 |
| 28 | 1977 | 14–9 | 60.9% | — | 1,890 | 0 | 2 | 1974 | 0–1 | 0.0% | — | 1,674 | 0 | 7 |
| 29 | 1978 | 5–11 | 31.2% | — | 1,808 | 0 | 2 | — | — | — | — | — | — | — |
| 31 | 1980 | 14–4 | 77.8% | — | 1,812 | 0 | 3 | — | — | — | — | — | — | — |
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 | Mona Guerrant | Stephanie Defina | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 1969 | — | — | — | — | 1 | 1 | 2 | 50.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 21 | 1970 | — | — | — | — | 1 | 2 | 3 | 33.3% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 22 | 1971 | 0 | 2 | 2 | 0.0% | 2 | 2 | 4 | 50.0% | 1 | 4 | 5 | 20.0% | — | — | — | — | 1968 | 4 | 6 | 10 | 40.0% | 20 | 7 | 27 | 74.1% | 7 | 7 | 14 | 50.0% | 2 | 2 | 4 | 50.0% |
| 23 | 1972 | 4 | 3 | 7 | 57.1% | 9 | 8 | 17 | 52.9% | 14 | 9 | 23 | 60.9% | 1 | 1 | 2 | 50.0% | 1969 | 1 | 1 | 2 | 50.0% | 17 | 5 | 22 | 77.3% | — | — | — | — | 6 | 2 | 8 | 75.0% |
| 24 | 1973 | 3 | 4 | 7 | 42.9% | 7 | 7 | 14 | 50.0% | 2 | 4 | 6 | 33.3% | 5 | 4 | 9 | 55.6% | 1970 | 4 | 3 | 7 | 57.1% | 26 | 9 | 35 | 74.3% | 1 | 2 | 3 | 33.3% | 2 | 2 | 4 | 50.0% |
| 25 | 1974 | 1 | 2 | 3 | 33.3% | 0 | 3 | 3 | 0.0% | 5 | 5 | 10 | 50.0% | 6 | 4 | 10 | 60.0% | 1971 | — | — | — | — | 0 | 2 | 2 | 0.0% | 0 | 1 | 1 | 0.0% | 1 | 6 | 7 | 14.3% |
| 26 | 1975 | 4 | 4 | 8 | 50.0% | 3 | 2 | 5 | 60.0% | 1 | 1 | 2 | 50.0% | 4 | 5 | 9 | 44.4% | 1972 | 1 | 1 | 2 | 50.0% | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — |
| 27 | 1976 | 2 | 3 | 5 | 40.0% | 0 | 1 | 1 | 0.0% | 5 | 2 | 7 | 71.4% | 8 | 8 | 16 | 50.0% | 1973 | 0 | 1 | 1 | 0.0% | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — |
| 28 | 1977 | 2 | 2 | 4 | 50.0% | 6 | 3 | 9 | 66.7% | 4 | 2 | 6 | 66.7% | 2 | 2 | 4 | 50.0% | 1974 | — | — | — | — | — | — | — | — | — | — | — | — | 0 | 1 | 1 | 0.0% |
| 29 | 1978 | — | — | — | — | 2 | 2 | 4 | 50.0% | 0 | 2 | 2 | 0.0% | 3 | 7 | 10 | 30.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 31 | 1980 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 2 | 1 | 3 | 66.7% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | — | 16 | 21 | 37 | 43.2% | 31 | 31 | 62 | 50.0% | 32 | 29 | 61 | 52.5% | 31 | 32 | 63 | 49.2% | — | 10 | 12 | 22 | 45.5% | 63 | 24 | 87 | 72.4% | 8 | 11 | 19 | 42.1% | 11 | 13 | 24 | 45.8% |
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 | Mona Guerrant | Stephanie Defina | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 1969 | 1500 | 92.5 | — | — | — | — | — | — | — | 40.0% | -2.40 | 1–0 | — | — | +0.28 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 21 | 1970 | 1504 | 106.4 | — | — | — | — | — | +14 | — | 42.9% | -1.00 | 0–1 | — | — | +0.10 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 22 | 1971 | 1517 | 118.6 | — | — | — | — | — | +38 | +14 | 35.7% | -0.75 | 2–4 (33%) | 0–3 (0%) | 95.8 | 0.00 | 1968 | 1678 | 117.2 | — | — | — | — | -196 | +95 | -126 | 56.8% | +0.45 | 13–9 (59%) | — | — | -1.36 |
| 23 | 1972 | 1734 | 136.4 | — | — | — | — | -121 | -79 | -58 | 56.3% | +0.56 | 8–11 (42%) | 5–0 (100%) | 103.8 | +0.32 | 1969 | 1761 | 138.3 | — | — | — | — | -91 | +61 | — | 71.6% | +1.86 | 3–3 (50%) | — | — | +0.05 |
| 24 | 1973 | 1781 | 144.7 | — | — | — | — | -54 | -77 | -115 | 48.8% | -0.15 | 3–5 (38%) | 2–2 (50%) | 99.8 | -3.77 | 1970 | 1789 | 133.4 | — | — | — | — | -88 | +98 | -231 | 62.9% | +1.05 | 7–4 (64%) | 1–0 | — | +0.80 |
| 25 | 1974 | 1779 | 137.0 | — | — | — | — | -26 | -97 | -75 | 50.9% | +0.11 | 1–4 (20%) | 3–4 (43%) | 97.1 | -1.56 | 1971 | 1707 | 111.7 | — | — | — | — | -58 | — | — | 10.0% | -2.90 | — | — | — | -0.83 |
| 26 | 1975 | 1906 | 154.1 | — | — | — | — | -52 | -116 | — | 48.2% | -0.13 | 5–3 (63%) | 2–4 (33%) | 103.0 | -3.85 | 1972 | 1714 | 107.0 | — | — | — | — | — | — | — | 33.3% | -1.83 | — | 1–0 | — | -0.95 |
| 27 | 1976 | 1898 | 149.2 | — | — | — | — | -30 | — | -110 | 55.9% | +0.57 | 2–8 (20%) | 2–5 (29%) | 93.6 | -2.51 | 1973 | 1686 | 100.5 | — | — | — | — | — | — | — | 0.0% | -3.50 | — | — | — | -0.40 |
| 28 | 1977 | 1890 | 136.0 | — | — | — | — | -64 | -47 | -93 | 57.7% | +0.69 | 4–4 (50%) | 3–1 (75%) | 100.8 | -0.54 | 1974 | 1675 | 102.4 | — | — | — | — | — | — | — | 0.0% | -1.50 | — | 0–1 | — | -0.06 |
| 29 | 1978 | 1809 | 135.5 | — | — | — | — | -44 | -17 | — | 35.9% | -0.87 | 3–4 (43%) | 0–3 (0%) | — | -2.29 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 31 | 1980 | 1812 | 138.2 | — | — | — | — | -108 | — | — | 73.8% | +2.26 | 4–2 (67%) | 1–0 | — | +0.36 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | — | 1942 | 149.0 | — | — | — | — | -53 | -61 | -71 | 52.5% | +0.27 | 33–46 (42%) | 18–22 (45%) | 98.6 | -5.68 | — | 1819 | 129.6 | — | — | — | — | -120 | +87 | -145 | 57.7% | +0.65 | 23–16 (59%) | 2–1 (67%) | 104.5 | -1.80 |
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 |
|---|---|---|---|---|---|
| Ann Kiyomura Hayashi | 5 | 3 | 8 | Oct 6, 1977 | H2H |
| Virginia Wade | 2 | 6 | 8 | Sep 8, 1977 | H2H |
| Martina Navratilova | 2 | 4 | 6 | Mar 2, 1978 | H2H |
| Evonne Goolagong | 0 | 6 | 6 | Feb 24, 1978 | H2H |
| Rosie Casals | 2 | 4 | 6 | Jan 20, 1978 | H2H |
| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Linda Tuero | 2 | 4 | 6 | May 30, 1970 | H2H |
| Valerie Ziegenfuss | 1 | 4 | 5 | Aug 18, 1972 | H2H |
| Mary Ann Eisel | 1 | 4 | 5 | Jan 10, 1971 | H2H |
| Nancy Richey | 1 | 4 | 5 | Apr 11, 1970 | H2H |
| Virginia Wade | 1 | 3 | 4 | Feb 4, 1972 | H2H |