Patricia Billing
all rivalries →| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Odile De Roubin | 0 | 1 | 1 | Sep 8, 1973 | H2H |
| Judy Chaloner | 0 | 1 | 1 | Jun 17, 1973 | H2H |
| Agneta Kun | 0 | 1 | 1 | May 30, 1973 | H2H |
| Chris Matison | 0 | 1 | 1 | May 24, 1973 | H2H |
| Janet Young | 0 | 1 | 1 | May 18, 1973 | H2H |
H2H data updated: 2026-09-12 00:00 UTC
Patricia Billing vs Carol Ann Kalogeropoulos H2H: 1-0
Patricia Billing holds a 1–0 lead over Carol Ann Kalogeropoulos in their WTA head-to-head. Across 1 main-draw meeting, Patricia Billing leads 1–0 on clay. Most recently, Patricia Billing won the 1972 Athens quarterfinal 6-4 6-2.
Want to explore more matchups? Advanced rivalry search lets you browse current and historical rivalries, unbeaten records, or every matchup for a player.
H2H Match Log
| Player | Score | Player | Match Data | Date | Round | Tournament | Category | Surface |
|---|---|---|---|---|---|---|---|---|
| Patricia Billing | 6-4 6-2 | Carol Ann Kalogeropoulos | Match data | Sep 16, 1972* | QF | Athens | 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.
Career Comparison
| 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 Billing | — | — | — | 1,500 | 3 | 14 | 17.6% | 0 | 0 | 0 | 0 | 0 | 0 |
| Carol Ann Kalogeropoulos | — | — | — | 1,500 | 7 | 44 | 13.7% | 0 | 0 | 0 | 0 | 0 | 0 |
Career Progression by Age
Seasons are aligned by the age each player spent most of that calendar year. GS and Titles are cumulative career totals through that season.
| Patricia Billing | Carol Ann Kalogeropoulos | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | W-L | Win % | Rank | Elo | GS | Titles | Yr | W-L | Win % | Rank | Elo | GS | Titles |
| 1972 | 2–9 | 18.2% | — | 1,427 | 0 | 0 | 1968 | 3–13 | 18.8% | — | 1,382 | 0 | 0 |
| 1973 | 1–5 | 16.7% | — | 1,395 | 0 | 0 | 1969 | 1–9 | 10.0% | — | 1,342 | 0 | 0 |
| — | — | — | — | — | — | — | 1970 | 1–9 | 10.0% | — | 1,292 | 0 | 0 |
| — | — | — | — | — | — | — | 1971 | 2–5 | 28.6% | — | 1,292 | 0 | 0 |
| — | — | — | — | — | — | — | 1972 | 0–7 | 0.0% | — | 1,254 | 0 | 0 |
| — | — | — | — | — | — | — | 1973 | 0–1 | 0.0% | — | 1,253 | 0 | 0 |
Surface Results by Career Season
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.
| Patricia Billing | Carol Ann Kalogeropoulos | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | Hard | Clay | Grass | Yr | Hard | Clay | Grass | ||||||||||||||||||
| W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | ||
| 1972 | — | — | — | — | 2 | 5 | 7 | 28.6% | 0 | 4 | 4 | 0.0% | 1968 | — | — | — | — | 3 | 13 | 16 | 18.8% | — | — | — | — |
| 1973 | — | — | — | — | 1 | 3 | 4 | 25.0% | 0 | 2 | 2 | 0.0% | 1969 | — | — | — | — | 1 | 8 | 9 | 11.1% | 0 | 1 | 1 | 0.0% |
| — | — | — | — | — | — | — | — | — | — | — | — | — | 1970 | — | — | — | — | 0 | 7 | 7 | 0.0% | 1 | 2 | 3 | 33.3% |
| — | — | — | — | — | — | — | — | — | — | — | — | — | 1971 | 1 | 1 | 2 | 50.0% | 0 | 3 | 3 | 0.0% | 1 | 1 | 2 | 50.0% |
| — | — | — | — | — | — | — | — | — | — | — | — | — | 1972 | 0 | 2 | 2 | 0.0% | 0 | 2 | 2 | 0.0% | 0 | 2 | 2 | 0.0% |
| — | — | — | — | — | — | — | — | — | — | — | — | — | 1973 | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — |
| Career | — | — | — | — | 3 | 8 | 11 | 27.3% | 0 | 6 | 6 | 0.0% | Career | 1 | 3 | 4 | 25.0% | 4 | 34 | 38 | 10.5% | 2 | 6 | 8 | 25.0% |
Advanced Statistics Comparison by Career Season
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.
| Patricia Billing | Carol Ann Kalogeropoulos | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| 1972 | 1427 | 87.7 | — | — | — | — | — | +21 | +73 | 27.3% | -1.86 | 0–2 | — | — | +1.76 | 1968 | 1382 | 86.5 | — | — | — | — | — | -64 | — | 25.0% | -1.86 | 1–5 (17%) | — | — | +0.42 |
| 1973 | 1395 | 87.3 | — | — | — | — | — | +28 | — | 15.4% | -2.85 | 1–0 | — | — | +0.84 | 1969 | 1343 | 89.9 | — | — | — | — | — | -67 | — | 17.6% | -2.35 | 0–1 | — | — | +0.69 |
| — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1970 | 1292 | 93.0 | — | — | — | — | — | -71 | — | 5.3% | -3.68 | 0–1 | — | — | +0.42 |
| — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1971 | 1292 | 96.9 | — | — | — | — | — | -92 | — | 23.1% | -2.15 | 0–1 | — | — | +0.46 |
| — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1972 | 1255 | 78.5 | — | — | — | — | — | — | — | 0.0% | -4.36 | — | — | — | +0.32 |
| — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1973 | 1254 | 102.0 | — | — | — | — | — | — | — | 0.0% | -4.00 | — | — | — | -0.12 |
| Career | 1500 | 87.6 | — | — | — | — | — | +24 | +73 | 22.9% | -2.23 | 1–2 (33%) | — | — | +16.25 | Career | 1500 | 84.2 | — | — | — | — | — | -69 | — | 15.8% | -2.71 | 1–8 (11%) | — | — | +4.76 |
Career Rivalries
Each player's five most-played main-draw opponents. The current matchup is highlighted when it appears in a player's top five.
Carol Ann Kalogeropoulos
all rivalries →| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Fiorella Bonicelli | 1 | 2 | 3 | Jun 23, 1972 | H2H |
| Patti Hogan | 0 | 2 | 2 | May 9, 1973 | H2H |
| Maria Teresa Nasuelli | 0 | 2 | 2 | Sep 5, 1970 | H2H |
| Esme Emmanuel | 1 | 1 | 2 | Jun 19, 1970 | H2H |
| Alessandra Gobbo | 0 | 2 | 2 | Aug 26, 1969 | H2H |