H2H data updated: 2026-09-14 00:00 UTC
Roberta Mccallum holds a 1–0 lead over Ann Kiyomura Hayashi in their WTA head-to-head. Across 1 main-draw meeting, Roberta Mccallum leads 1–0 on carpet. Most recently, Roberta Mccallum won the 1980 Houston round of 32 3-6 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 |
|---|---|---|---|---|---|---|---|---|
| Roberta Mccallum | 3-6 6-3 6-3 | Ann Kiyomura Hayashi | Match data | Feb 28, 1980* | R32 | Houston | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ann Kiyomura Hayashi | — | — | — | 1,925 | 182 | 200 | 47.6% | 0 | 0 | 0 | 0 | 2 | 2 |
| Roberta Mccallum | — | — | — | 1,660 | 24 | 43 | 35.8% | 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.
| Ann Kiyomura Hayashi | Roberta Mccallum | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | W-L | Win % | Rank | Elo | GS | Titles | Yr | W-L | Win % | Rank | Elo | GS | Titles |
| 1968 | 0–1 | 0.0% | — | 1,488 | 0 | 0 | 1978 | 0–1 | 0.0% | — | 1,484 | 0 | 0 |
| 1969 | 0–1 | 0.0% | — | 1,473 | 0 | 0 | 1979 | 6–5 | 54.5% | — | 1,573 | 0 | 0 |
| 1970 | 0–1 | 0.0% | — | 1,459 | 0 | 0 | 1980 | 14–27 | 34.1% | — | 1,582 | 0 | 0 |
| 1971 | 0–1 | 0.0% | — | 1,457 | 0 | 0 | 1981 | 4–9 | 30.8% | — | 1,568 | 0 | 0 |
| 1972 | 5–4 | 55.6% | — | 1,516 | 0 | 0 | 1982 | 0–1 | 0.0% | — | 1,549 | 0 | 0 |
| 1973 | 28–30 | 48.3% | — | 1,648 | 0 | 0 | — | — | — | — | — | — | — |
| 1974 | 24–13 | 64.9% | — | 1,789 | 0 | 0 | — | — | — | — | — | — | — |
| 1975 | 7–12 | 36.8% | — | 1,749 | 0 | 0 | — | — | — | — | — | — | — |
| 1976 | 9–16 | 36.0% | — | 1,724 | 0 | 0 | — | — | — | — | — | — | — |
| 1977 | 4–8 | 33.3% | — | 1,740 | 0 | 0 | — | — | — | — | — | — | — |
| 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.
| Ann Kiyomura Hayashi | Roberta Mccallum | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 % | ||
| 1968 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | 1979 | — | — | — | — | — | — | — | — | 3 | 4 | 7 | 42.9% | — | — | — | — |
| 1969 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | 1980 | 3 | 4 | 7 | 42.9% | 0 | 3 | 3 | 0.0% | 1 | 4 | 5 | 20.0% | 10 | 16 | 26 | 38.5% |
| 1970 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | 1981 | 2 | 4 | 6 | 33.3% | 0 | 1 | 1 | 0.0% | 0 | 1 | 1 | 0.0% | 2 | 3 | 5 | 40.0% |
| 1971 | — | — | — | — | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | 1982 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — |
| 1972 | — | — | — | — | 1 | 1 | 2 | 50.0% | 4 | 2 | 6 | 66.7% | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1973 | 4 | 5 | 9 | 44.4% | 7 | 7 | 14 | 50.0% | 11 | 11 | 22 | 50.0% | 6 | 7 | 13 | 46.2% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1974 | 5 | 2 | 7 | 71.4% | 1 | 2 | 3 | 33.3% | 14 | 7 | 21 | 66.7% | 4 | 2 | 6 | 66.7% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1975 | 4 | 4 | 8 | 50.0% | 0 | 1 | 1 | 0.0% | 2 | 2 | 4 | 50.0% | 0 | 4 | 4 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1976 | 0 | 1 | 1 | 0.0% | 2 | 2 | 4 | 50.0% | 2 | 4 | 6 | 33.3% | 5 | 9 | 14 | 35.7% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1977 | 0 | 1 | 1 | 0.0% | 0 | 1 | 1 | 0.0% | 2 | 1 | 3 | 66.7% | 2 | 5 | 7 | 28.6% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 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 | 47 | 48 | 95 | 49.5% | 17 | 17 | 34 | 50.0% | 62 | 57 | 119 | 52.1% | 55 | 77 | 132 | 41.7% | Career | 5 | 9 | 14 | 35.7% | 0 | 4 | 4 | 0.0% | 4 | 9 | 13 | 30.8% | 12 | 19 | 31 | 38.7% |
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.
| Ann Kiyomura Hayashi | Roberta Mccallum | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| 1968 | 1488 | 90.8 | — | — | — | — | — | — | — | 0.0% | -6.00 | — | — | — | -0.08 | 1978 | 1484 | 96.8 | — | — | — | — | — | — | — | 0.0% | -3.50 | — | 0–1 | — | +0.04 |
| 1969 | 1473 | 94.6 | — | — | — | — | — | — | — | 0.0% | -4.50 | — | — | — | +0.08 | 1979 | 1573 | 116.3 | — | — | — | — | — | — | +15 | 50.0% | -0.46 | 1–3 (25%) | 1–0 | — | -0.41 |
| 1970 | 1460 | 98.9 | — | — | — | — | — | — | — | 0.0% | -2.00 | — | 0–1 | — | +0.19 | 1980 | 1582 | 127.2 | — | — | — | — | +6 | -80 | -45 | 35.9% | -1.14 | 5–5 (50%) | 1–2 (33%) | 99.9 | +1.55 |
| 1971 | 1457 | 104.8 | — | — | — | — | — | — | — | 33.3% | -0.67 | 0–1 | — | — | -0.19 | 1981 | 1568 | 107.3 | — | — | — | — | +56 | — | — | 33.3% | -1.81 | 0–1 | 2–1 (67%) | — | +0.48 |
| 1972 | 1516 | 107.6 | — | — | — | — | — | — | +85 | 47.6% | +0.24 | 3–0 (100%) | 0–1 | — | +1.18 | 1982 | 1549 | 95.7 | — | — | — | — | — | — | — | 0.0% | -4.00 | — | — | — | +0.17 |
| 1973 | 1648 | 127.6 | — | — | — | — | -75 | -23 | -24 | 50.0% | -0.14 | 8–12 (40%) | 4–4 (50%) | 99.3 | +4.25 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1974 | 1789 | 136.8 | — | — | — | — | -106 | -163 | +40 | 59.5% | +0.55 | 8–4 (67%) | 2–1 (67%) | 107.2 | +0.93 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1975 | 1750 | 124.3 | — | — | — | — | -7 | — | +32 | 38.6% | -1.16 | 3–5 (38%) | 2–1 (67%) | 100.1 | -0.93 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1976 | 1724 | 127.9 | — | — | — | — | -53 | -75 | +49 | 41.1% | -0.80 | 3–5 (38%) | 1–1 | — | -0.96 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 1977 | 1740 | 135.0 | — | — | — | — | -68 | — | +42 | 37.0% | -0.93 | 1–2 (33%) | 0–1 | — | -1.45 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 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 | 1926 | 140.1 | — | — | — | — | -21 | -76 | +3 | 48.0% | -0.26 | 62–60 (51%) | 33–26 (56%) | 104.8 | -1.34 | Career | 1661 | 121.1 | — | — | — | — | +19 | -80 | -10 | 36.6% | -1.23 | 6–9 (40%) | 4–4 (50%) | 98.5 | +2.73 |
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 |
|---|---|---|---|---|---|
| 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 |
| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Pam Shriver | 1 | 2 | 3 | Mar 13, 1981 | H2H |
| Hana Mandlikova | 0 | 3 | 3 | Oct 23, 1980 | H2H |
| Billie Jean King | 0 | 3 | 3 | Oct 4, 1980 | H2H |
| Lele Forood | 2 | 1 | 3 | Oct 2, 1980 | H2H |
| Dianne Fromholtz | 0 | 3 | 3 | Sep 25, 1980 | H2H |