H2H data updated: 2026-09-13 00:00 UTC
Mona Guerrant holds a 5–3 lead over Ann Kiyomura Hayashi in their WTA head-to-head. Across 8 main-draw meetings, they are tied 2–2 on carpet, while Mona Guerrant leads 2–0 on grass. Most recently, Ann Kiyomura Hayashi won the 1977 Atlanta round of 32 6-2 4-6 7-5.
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 |
|---|---|---|---|---|---|---|---|---|
| Ann Kiyomura Hayashi | 6-2 4-6 7-5 | Mona Guerrant | Match data | Oct 6, 1977* | R32 | Atlanta | WTA 250 | Carpet |
| Mona Guerrant | 6-4 7-9 6-2 | Ann Kiyomura Hayashi | Match data | Jun 18, 1976* | R16 | Eastbourne Open | WTA 250 | Grass |
| Mona Guerrant | 7-6(0) 6-3 | Ann Kiyomura Hayashi | Match data | Mar 31, 1976* | R32 | Philadelphia | WTA 250 | Carpet |
| Ann Kiyomura Hayashi | 6-4 3-6 7-6(0) | Mona Guerrant | Match data | Feb 21, 1976* | R16 | Detroit | WTA 250 | Carpet |
| Ann Kiyomura Hayashi | 2-6 6-4 6-4 | Mona Guerrant | Match data | Oct 10, 1975* | R16 | Phoenix | WTA 250 | Hard |
| Mona Guerrant | 6-1 4-6 6-1 | Ann Kiyomura Hayashi | Match data | Sep 20, 1973* | R32 | Houston | WTA 250 | Hard |
| Mona Guerrant | 1-6 6-2 6-4 | Ann Kiyomura Hayashi | Match data | Jun 29, 1973* | R64 | Wimbledon | Grand Slam | Grass |
| Mona Guerrant | 6-2 6-2 | Ann Kiyomura Hayashi | Match data | Jan 6, 1973* | SF | Portland | WTA 250 | Carpet |
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 |
| Ann Kiyomura Hayashi | — | — | — | 1,925 | 182 | 200 | 47.6% | 0 | 0 | 0 | 0 | 2 | 2 |
Seasons are aligned by the age each player spent most of that calendar year. GS and Titles are cumulative career totals through that season.
| Mona Guerrant | Ann Kiyomura Hayashi | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | W-L | Win % | Rank | Elo | GS | Titles | Yr | W-L | Win % | Rank | Elo | GS | Titles |
| 1969 | 1–1 | 50.0% | — | 1,500 | 0 | 0 | 1968 | 0–1 | 0.0% | — | 1,488 | 0 | 0 |
| 1970 | 1–2 | 33.3% | — | 1,504 | 0 | 0 | 1969 | 0–1 | 0.0% | — | 1,473 | 0 | 0 |
| 1971 | 3–8 | 27.3% | — | 1,517 | 0 | 0 | 1970 | 0–1 | 0.0% | — | 1,459 | 0 | 0 |
| 1972 | 28–22 | 56.0% | — | 1,733 | 0 | 1 | 1971 | 0–1 | 0.0% | — | 1,457 | 0 | 0 |
| 1973 | 17–19 | 47.2% | — | 1,780 | 0 | 2 | 1972 | 5–4 | 55.6% | — | 1,516 | 0 | 0 |
| 1974 | 12–14 | 46.2% | — | 1,779 | 0 | 2 | 1973 | 28–30 | 48.3% | — | 1,648 | 0 | 0 |
| 1975 | 12–12 | 50.0% | — | 1,905 | 0 | 2 | 1974 | 24–13 | 64.9% | — | 1,789 | 0 | 0 |
| 1976 | 15–14 | 51.7% | — | 1,898 | 0 | 2 | 1975 | 7–12 | 36.8% | — | 1,749 | 0 | 0 |
| 1977 | 14–9 | 60.9% | — | 1,890 | 0 | 2 | 1976 | 9–16 | 36.0% | — | 1,724 | 0 | 0 |
| 1978 | 5–11 | 31.2% | — | 1,808 | 0 | 2 | 1977 | 4–8 | 33.3% | — | 1,740 | 0 | 0 |
| 1980 | 14–4 | 77.8% | — | 1,812 | 0 | 3 | 1978 | 10–7 | 58.8% | — | 1,809 | 0 | 1 |
| — | — | — | — | — | — | — | 1979 | 26–22 | 54.2% | — | 1,874 | 0 | 1 |
| — | — | — | — | — | — | — | 1980 | 13–20 | 39.4% | — | 1,718 | 0 | 1 |
| — | — | — | — | — | — | — | 1981 | 23–19 | 54.8% | — | 1,852 | 0 | 2 |
| — | — | — | — | — | — | — | 1982 | 18–20 | 47.4% | — | 1,828 | 0 | 2 |
| — | — | — | — | — | — | — | 1983 | 13–20 | 39.4% | — | 1,716 | 0 | 2 |
| — | — | — | — | — | — | — | 1984 | 2–5 | 28.6% | — | 1,686 | 0 | 2 |
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.
| Mona Guerrant | Ann Kiyomura Hayashi | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 % | ||
| 1969 | — | — | — | — | 1 | 1 | 2 | 50.0% | — | — | — | — | — | — | — | — | 1968 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — |
| 1970 | — | — | — | — | 1 | 2 | 3 | 33.3% | — | — | — | — | — | — | — | — | 1969 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — |
| 1971 | 0 | 2 | 2 | 0.0% | 2 | 2 | 4 | 50.0% | 1 | 4 | 5 | 20.0% | — | — | — | — | 1970 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — |
| 1972 | 4 | 3 | 7 | 57.1% | 9 | 8 | 17 | 52.9% | 14 | 9 | 23 | 60.9% | 1 | 1 | 2 | 50.0% | 1971 | — | — | — | — | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — |
| 1973 | 3 | 4 | 7 | 42.9% | 7 | 7 | 14 | 50.0% | 2 | 4 | 6 | 33.3% | 5 | 4 | 9 | 55.6% | 1972 | — | — | — | — | 1 | 1 | 2 | 50.0% | 4 | 2 | 6 | 66.7% | 0 | 1 | 1 | 0.0% |
| 1974 | 1 | 2 | 3 | 33.3% | 0 | 3 | 3 | 0.0% | 5 | 5 | 10 | 50.0% | 6 | 4 | 10 | 60.0% | 1973 | 4 | 5 | 9 | 44.4% | 7 | 7 | 14 | 50.0% | 11 | 11 | 22 | 50.0% | 6 | 7 | 13 | 46.2% |
| 1975 | 4 | 4 | 8 | 50.0% | 3 | 2 | 5 | 60.0% | 1 | 1 | 2 | 50.0% | 4 | 5 | 9 | 44.4% | 1974 | 5 | 2 | 7 | 71.4% | 1 | 2 | 3 | 33.3% | 14 | 7 | 21 | 66.7% | 4 | 2 | 6 | 66.7% |
| 1976 | 2 | 3 | 5 | 40.0% | 0 | 1 | 1 | 0.0% | 5 | 2 | 7 | 71.4% | 8 | 8 | 16 | 50.0% | 1975 | 4 | 4 | 8 | 50.0% | 0 | 1 | 1 | 0.0% | 2 | 2 | 4 | 50.0% | 0 | 4 | 4 | 0.0% |
| 1977 | 2 | 2 | 4 | 50.0% | 6 | 3 | 9 | 66.7% | 4 | 2 | 6 | 66.7% | 2 | 2 | 4 | 50.0% | 1976 | 0 | 1 | 1 | 0.0% | 2 | 2 | 4 | 50.0% | 2 | 4 | 6 | 33.3% | 5 | 9 | 14 | 35.7% |
| 1978 | — | — | — | — | 2 | 2 | 4 | 50.0% | 0 | 2 | 2 | 0.0% | 3 | 7 | 10 | 30.0% | 1977 | 0 | 1 | 1 | 0.0% | 0 | 1 | 1 | 0.0% | 2 | 1 | 3 | 66.7% | 2 | 5 | 7 | 28.6% |
| 1980 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 2 | 1 | 3 | 66.7% | 1978 | 4 | 2 | 6 | 66.7% | 4 | 0 | 4 | 100.0% | 1 | 2 | 3 | 33.3% | 1 | 3 | 4 | 25.0% |
| — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1979 | 10 | 7 | 17 | 58.8% | — | — | — | — | 1 | 2 | 3 | 33.3% | 15 | 13 | 28 | 53.6% |
| — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1980 | 7 | 7 | 14 | 50.0% | — | — | — | — | 3 | 5 | 8 | 37.5% | 3 | 8 | 11 | 27.3% |
| — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1981 | 2 | 4 | 6 | 33.3% | 2 | 2 | 4 | 50.0% | 9 | 6 | 15 | 60.0% | 10 | 7 | 17 | 58.8% |
| — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1982 | 6 | 5 | 11 | 54.5% | 0 | 1 | 1 | 0.0% | 7 | 6 | 13 | 53.8% | 5 | 8 | 13 | 38.5% |
| — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1983 | 5 | 5 | 10 | 50.0% | — | — | — | — | 4 | 6 | 10 | 40.0% | 4 | 9 | 13 | 30.8% |
| — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1984 | 0 | 2 | 2 | 0.0% | — | — | — | — | 2 | 2 | 4 | 50.0% | 0 | 1 | 1 | 0.0% |
| Career | 16 | 21 | 37 | 43.2% | 31 | 31 | 62 | 50.0% | 32 | 29 | 61 | 52.5% | 31 | 32 | 63 | 49.2% | Career | 47 | 48 | 95 | 49.5% | 17 | 17 | 34 | 50.0% | 62 | 57 | 119 | 52.1% | 55 | 77 | 132 | 41.7% |
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.
| Mona Guerrant | Ann Kiyomura Hayashi | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| 1969 | 1500 | 92.5 | — | — | — | — | — | — | — | 40.0% | -2.40 | 1–0 | — | — | +0.28 | 1968 | 1488 | 90.8 | — | — | — | — | — | — | — | 0.0% | -6.00 | — | — | — | -0.08 |
| 1970 | 1504 | 106.4 | — | — | — | — | — | +14 | — | 42.9% | -1.00 | 0–1 | — | — | +0.10 | 1969 | 1473 | 94.6 | — | — | — | — | — | — | — | 0.0% | -4.50 | — | — | — | +0.08 |
| 1971 | 1517 | 118.6 | — | — | — | — | — | +38 | +14 | 35.7% | -0.75 | 2–4 (33%) | 0–3 (0%) | 95.8 | 0.00 | 1970 | 1460 | 98.9 | — | — | — | — | — | — | — | 0.0% | -2.00 | — | 0–1 | — | +0.19 |
| 1972 | 1734 | 136.4 | — | — | — | — | -121 | -79 | -58 | 56.3% | +0.56 | 8–11 (42%) | 5–0 (100%) | 103.8 | +0.32 | 1971 | 1457 | 104.8 | — | — | — | — | — | — | — | 33.3% | -0.67 | 0–1 | — | — | -0.19 |
| 1973 | 1781 | 144.7 | — | — | — | — | -54 | -77 | -115 | 48.8% | -0.15 | 3–5 (38%) | 2–2 (50%) | 99.8 | -3.77 | 1972 | 1516 | 107.6 | — | — | — | — | — | — | +85 | 47.6% | +0.24 | 3–0 (100%) | 0–1 | — | +1.18 |
| 1974 | 1779 | 137.0 | — | — | — | — | -26 | -97 | -75 | 50.9% | +0.11 | 1–4 (20%) | 3–4 (43%) | 97.1 | -1.56 | 1973 | 1648 | 127.6 | — | — | — | — | -75 | -23 | -24 | 50.0% | -0.14 | 8–12 (40%) | 4–4 (50%) | 99.3 | +4.25 |
| 1975 | 1906 | 154.1 | — | — | — | — | -52 | -116 | — | 48.2% | -0.13 | 5–3 (63%) | 2–4 (33%) | 103.0 | -3.85 | 1974 | 1789 | 136.8 | — | — | — | — | -106 | -163 | +40 | 59.5% | +0.55 | 8–4 (67%) | 2–1 (67%) | 107.2 | +0.93 |
| 1976 | 1898 | 149.2 | — | — | — | — | -30 | — | -110 | 55.9% | +0.57 | 2–8 (20%) | 2–5 (29%) | 93.6 | -2.51 | 1975 | 1750 | 124.3 | — | — | — | — | -7 | — | +32 | 38.6% | -1.16 | 3–5 (38%) | 2–1 (67%) | 100.1 | -0.93 |
| 1977 | 1890 | 136.0 | — | — | — | — | -64 | -47 | -93 | 57.7% | +0.69 | 4–4 (50%) | 3–1 (75%) | 100.8 | -0.54 | 1976 | 1724 | 127.9 | — | — | — | — | -53 | -75 | +49 | 41.1% | -0.80 | 3–5 (38%) | 1–1 | — | -0.96 |
| 1978 | 1809 | 135.5 | — | — | — | — | -44 | -17 | — | 35.9% | -0.87 | 3–4 (43%) | 0–3 (0%) | — | -2.29 | 1977 | 1740 | 135.0 | — | — | — | — | -68 | — | +42 | 37.0% | -0.93 | 1–2 (33%) | 0–1 | — | -1.45 |
| 1980 | 1812 | 138.2 | — | — | — | — | -108 | — | — | 73.8% | +2.26 | 4–2 (67%) | 1–0 | — | +0.36 | 1978 | 1810 | 140.1 | — | — | — | — | -59 | -135 | -22 | 56.8% | +0.62 | 2–1 (67%) | 1–2 (33%) | 100.7 | -0.22 |
| — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1979 | 1875 | 150.3 | — | — | — | — | +16 | — | -129 | 53.6% | +0.14 | 12–8 (60%) | 5–4 (56%) | 104.4 | -0.58 |
| — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1980 | 1719 | 127.4 | — | — | — | — | +24 | — | -38 | 46.7% | -0.05 | 4–9 (31%) | 2–4 (33%) | 91.8 | -0.63 |
| — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1981 | 1852 | 135.7 | — | — | — | — | -26 | -139 | -64 | 53.7% | +0.03 | 6–5 (55%) | 3–2 (60%) | 101.7 | -0.47 |
| — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1982 | 1828 | 133.7 | — | — | — | — | -41 | — | 0 | 43.0% | -0.73 | 9–5 (64%) | 6–1 (86%) | 108.1 | -4.10 |
| — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1983 | 1717 | 130.9 | — | — | — | — | +25 | — | +29 | 42.0% | -0.68 | 2–3 (40%) | 6–3 (67%) | 100.2 | -1.71 |
| — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1984 | 1687 | 109.3 | — | — | — | — | -20 | — | +88 | 26.7% | -2.27 | 1–0 | 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 | Career | 1926 | 140.1 | — | — | — | — | -21 | -76 | +3 | 48.0% | -0.26 | 62–60 (51%) | 33–26 (56%) | 104.8 | -1.34 |
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 |
|---|---|---|---|---|---|
| Martina Navratilova | 0 | 12 | 12 | Jun 20, 1984 | H2H |
| Wendy Turnbull | 2 | 8 | 10 | Mar 17, 1983 | H2H |
| Dianne Fromholtz | 0 | 10 | 10 | Jan 13, 1983 | H2H |
| Sue Barker | 2 | 6 | 8 | Aug 18, 1983 | H2H |
| Mona Guerrant | 3 | 5 | 8 | Oct 6, 1977 | H2H |