H2H data updated: 2026-09-14 00:00 UTC
Ekaterina Bychkova holds a 1–0 lead over Zi Yan in their WTA head-to-head. Across 1 main-draw meeting, Ekaterina Bychkova leads 1–0 on hard courts. Most recently, Ekaterina Bychkova won the 2007 US Open first round 6-2 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 |
|---|---|---|---|---|---|---|---|---|
| Ekaterina Bychkova | 6-2 6-4 | Zi Yan | Match data | Aug 29, 2007* | R128 | US Open | Grand Slam | Hard |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ekaterina Bychkova | #814 | #66 | 588 | 1,570 | 34 | 67 | 33.7% | 0 | 0 | 0 | 0 | 0 | 0 |
| Zi Yan | #789 | #40 | 678 | 1,620 | 34 | 58 | 37.0% | 0 | 0 | 0 | 0 | 1 | 1 |
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 | Ekaterina Bychkova | Zi Yan | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | W-L | Win % | Rank | Elo | GS | Titles | Yr | W-L | Win % | Rank | Elo | GS | Titles | |
| 17 | — | — | — | — | — | — | — | 2002 | 0–1 | 0.0% | #297 | 1,486 | 0 | 0 |
| 18 | — | — | — | — | — | — | — | 2003 | 2–3 | 40.0% | #161 | 1,486 | 0 | 0 |
| 19 | 2004 | 1–1 | 50.0% | #155 | 1,504 | 0 | 0 | 2004 | 0–4 | 0.0% | #296 | 1,451 | 0 | 0 |
| 20 | 2005 | 9–10 | 47.4% | #70 | 1,545 | 0 | 0 | 2005 | 8–4 | 66.7% | #104 | 1,573 | 0 | 1 |
| 21 | 2006 | 9–21 | 30.0% | #76 | 1,483 | 0 | 0 | 2006 | 6–16 | 27.3% | #166 | 1,484 | 0 | 1 |
| 22 | 2007 | 5–13 | 27.8% | #111 | 1,464 | 0 | 0 | 2007 | 10–12 | 45.5% | #58 | 1,543 | 0 | 1 |
| 23 | 2008 | 5–12 | 29.4% | #117 | 1,443 | 0 | 0 | 2008 | 7–14 | 33.3% | #126 | 1,527 | 0 | 1 |
| 24 | 2009 | 1–3 | 25.0% | #121 | 1,431 | 0 | 0 | 2009 | 0–3 | 0.0% | #306 | 1,486 | 0 | 1 |
| 25 | 2010 | 3–4 | 42.9% | #181 | 1,479 | 0 | 0 | 2010 | 1–1 | 50.0% | #422 | 1,495 | 0 | 1 |
| 26 | 2011 | 0–1 | 0.0% | #171 | 1,477 | 0 | 0 | — | — | — | — | — | — | — |
| 27 | 2012 | 0–1 | 0.0% | #208 | 1,463 | 0 | 0 | — | — | — | — | — | — | — |
| 28 | 2013 | 1–1 | 50.0% | #159 | 1,484 | 0 | 0 | — | — | — | — | — | — | — |
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 | Ekaterina Bychkova | Zi Yan | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 % | |||
| 17 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2002 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — |
| 18 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2003 | 2 | 2 | 4 | 50.0% | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — |
| 19 | 2004 | 1 | 1 | 2 | 50.0% | — | — | — | — | — | — | — | — | — | — | — | — | 2004 | 0 | 3 | 3 | 0.0% | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — |
| 20 | 2005 | 7 | 8 | 15 | 46.7% | 2 | 2 | 4 | 50.0% | — | — | — | — | — | — | — | — | 2005 | 6 | 2 | 8 | 75.0% | 2 | 2 | 4 | 50.0% | — | — | — | — | — | — | — | — |
| 21 | 2006 | 7 | 11 | 18 | 38.9% | 0 | 8 | 8 | 0.0% | 1 | 1 | 2 | 50.0% | 1 | 1 | 2 | 50.0% | 2006 | 2 | 10 | 12 | 16.7% | 3 | 4 | 7 | 42.9% | 1 | 2 | 3 | 33.3% | — | — | — | — |
| 22 | 2007 | 3 | 6 | 9 | 33.3% | 1 | 4 | 5 | 20.0% | 0 | 2 | 2 | 0.0% | 1 | 1 | 2 | 50.0% | 2007 | 8 | 7 | 15 | 53.3% | 2 | 3 | 5 | 40.0% | 0 | 2 | 2 | 0.0% | — | — | — | — |
| 23 | 2008 | 5 | 6 | 11 | 45.5% | 0 | 5 | 5 | 0.0% | 0 | 1 | 1 | 0.0% | — | — | — | — | 2008 | 5 | 9 | 14 | 35.7% | 2 | 4 | 6 | 33.3% | 0 | 1 | 1 | 0.0% | — | — | — | — |
| 24 | 2009 | 1 | 3 | 4 | 25.0% | — | — | — | — | — | — | — | — | — | — | — | — | 2009 | 0 | 2 | 2 | 0.0% | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — |
| 25 | 2010 | 3 | 3 | 6 | 50.0% | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 2010 | 1 | 1 | 2 | 50.0% | — | — | — | — | — | — | — | — | — | — | — | — |
| 26 | 2011 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 27 | 2012 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 28 | 2013 | 1 | 1 | 2 | 50.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | — | 28 | 41 | 69 | 40.6% | 3 | 20 | 23 | 13.0% | 1 | 4 | 5 | 20.0% | 2 | 2 | 4 | 50.0% | — | 24 | 37 | 61 | 39.3% | 9 | 16 | 25 | 36.0% | 1 | 5 | 6 | 16.7% | — | — | — | — |
Seasons are aligned by the age each player spent most of that calendar year. Detailed serve and return statistics available for 58/99 of Ekaterina Bychkova's and 52/70 of Zi Yan's main draw matches. Sample is shown as matches with detailed serve and return statistics / total main draw matches. Bold green marks the stronger value when both stat samples contain at least 5 matches; lower is better for DFs/M.
| Age | Ekaterina Bychkova | Zi Yan | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | Sample | Aces/M | DFs/M | 1st Sv% | 1st Pts% | 2nd Pts% | BP Saved% | BP Conv% | Svc Pts% | Ret Pts% | Yr | Sample | Aces/M | DFs/M | 1st Sv% | 1st Pts% | 2nd Pts% | BP Saved% | BP Conv% | Svc Pts% | Ret Pts% | |
| 20 | 2005 | 1/19 | 5.0 | 2.0 | 67.3% | 72.7% | 37.5% | 0.0% | 54.5% | 61.2% | 54.7% | — | —/— | — | — | — | — | — | — | — | — | — |
| 21 | 2006 | 16/30 | 3.9 | 2.8 | 50.8% | 62.4% | 43.3% | 55.4% | 42.8% | 53.3% | 41.1% | 2006 | 10/22 | 1.8 | 3.3 | 64.1% | 56.8% | 43.0% | 56.3% | 48.9% | 52.2% | 41.1% |
| 22 | 2007 | 15/18 | 4.2 | 3.7 | 52.0% | 66.1% | 41.6% | 54.5% | 45.8% | 54.8% | 39.2% | 2007 | 18/22 | 1.3 | 2.6 | 65.3% | 60.0% | 45.6% | 47.1% | 55.2% | 54.9% | 44.5% |
| 23 | 2008 | 12/17 | 5.1 | 3.1 | 50.3% | 67.9% | 38.0% | 55.9% | 59.4% | 53.4% | 37.7% | 2008 | 20/21 | 0.9 | 3.6 | 63.5% | 56.5% | 41.5% | 49.7% | 43.3% | 51.0% | 44.6% |
| 24 | 2009 | 3/4 | 6.3 | 4.7 | 42.0% | 76.7% | 49.6% | 55.1% | 36.1% | 60.1% | 35.9% | 2009 | 2/3 | 1.0 | 4.5 | 62.7% | 53.0% | 39.2% | 33.3% | 47.3% | 47.8% | 44.6% |
| 25 | 2010 | 7/7 | 5.0 | 7.1 | 49.4% | 70.9% | 42.4% | 58.5% | 50.9% | 57.1% | 42.4% | 2010 | 2/2 | 0.0 | 2.5 | 62.7% | 53.2% | 38.5% | 39.3% | 33.6% | 47.7% | 39.0% |
| 26 | 2011 | 1/1 | 2.0 | 6.0 | 29.4% | 80.0% | 38.9% | 33.3% | 0.0% | 51.0% | 30.0% | — | —/— | — | — | — | — | — | — | — | — | — |
| 27 | 2012 | 1/1 | 4.0 | 11.0 | 51.1% | 71.7% | 38.6% | 40.0% | 45.5% | 55.6% | 40.4% | — | —/— | — | — | — | — | — | — | — | — | — |
| 28 | 2013 | 2/2 | 5.0 | 1.5 | 41.3% | 66.9% | 57.2% | 72.7% | 70.8% | 64.0% | 57.8% | — | —/— | — | — | — | — | — | — | — | — | — |
| Career | — | 58/101 | 4.5 | 3.8 | 50.0% | 67.1% | 42.2% | 54.6% | 48.1% | 55.0% | 40.4% | — | 52/92 | 1.2 | 3.2 | 64.2% | 57.5% | 43.0% | 49.1% | 48.3% | 52.3% | 43.7% |
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 | Ekaterina Bychkova | Zi Yan | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | |
| 17 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2002 | 1486 | 99.3 | — | — | — | — | — | — | — | 0.0% | -2.50 | — | — | — | +0.03 |
| 18 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2003 | 1486 | 101.9 | — | — | — | — | +30 | — | — | 45.5% | -0.09 | 0–1 | 1–1 | — | +0.26 |
| 19 | 2004 | 1505 | 101.3 | — | — | — | — | — | — | — | 50.0% | 0.00 | — | — | — | +0.10 | 2004 | 1451 | 99.1 | — | — | — | — | +21 | — | — | 27.3% | -1.82 | 0–3 (0%) | 1–0 | — | -0.09 |
| 20 | 2005 | 1545 | 115.8 | +0.50 | +0.36 | 1.410 | 57.5% | +2 | +5 | — | 50.0% | +0.29 | 1–3 (25%) | 0–1 | — | +0.61 | 2005 | 1573 | 115.2 | — | — | — | — | +3 | -61 | — | 60.0% | +0.80 | 2–1 (67%) | 2–2 (50%) | 101.7 | +0.28 |
| 21 | 2006 | 1484 | 116.4 | -1.26 | -2.26 | 0.878 | 47.5% | +45 | -42 | — | 34.4% | -0.95 | 2–6 (25%) | 2–4 (33%) | 95.9 | -0.25 | 2006 | 1485 | 107.1 | -2.70 | -1.75 | 0.860 | 47.0% | -6 | +46 | +98 | 32.0% | -1.34 | 2–4 (33%) | 2–2 (50%) | 98.8 | -0.22 |
| 22 | 2007 | 1465 | 117.0 | -0.97 | -2.69 | 0.867 | 47.1% | +81 | -55 | — | 35.7% | -0.74 | 1–5 (17%) | 1–3 (25%) | 95.4 | +0.08 | 2007 | 1543 | 115.3 | -0.92 | 0.00 | 0.986 | 49.7% | +13 | -15 | — | 37.8% | -0.64 | 4–3 (57%) | 2–0 | — | +1.07 |
| 23 | 2008 | 1444 | 105.6 | -1.14 | -3.36 | 0.808 | 45.9% | +97 | -83 | — | 36.8% | -1.03 | 2–4 (33%) | 2–1 (67%) | 99.1 | +0.33 | 2008 | 1528 | 117.9 | -2.92 | -0.04 | 0.910 | 47.8% | +36 | -10 | — | 31.9% | -1.15 | 4–3 (57%) | 1–0 | — | -0.15 |
| 24 | 2009 | 1431 | 96.6 | -0.72 | -0.93 | 0.899 | 48.4% | +80 | — | — | 33.3% | -1.33 | 0–1 | 0–1 | — | +0.33 | 2009 | 1486 | 98.3 | -0.13 | -1.41 | 0.855 | 46.2% | — | — | — | 14.3% | -2.00 | 0–1 | — | — | +0.21 |
| 25 | 2010 | 1480 | 116.9 | +1.66 | -1.32 | 0.989 | 49.8% | +69 | — | — | 44.4% | -0.17 | 2–2 (50%) | 1–1 | — | -0.38 | 2010 | 1495 | 98.7 | -4.24 | -2.37 | 0.747 | 44.1% | — | — | — | 40.0% | -1.80 | 1–0 | 1–0 | — | +0.07 |
| 26 | 2011 | 1478 | 105.3 | +2.99 | +1.39 | 0.612 | 40.6% | — | — | — | 0.0% | -4.00 | — | — | — | -0.20 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 27 | 2012 | 1464 | 100.6 | -3.44 | -4.61 | 0.910 | 48.0% | — | — | — | 33.3% | -0.33 | 0–1 | — | — | +0.08 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 28 | 2013 | 1484 | 103.1 | +0.17 | +3.42 | 1.605 | 61.7% | — | — | — | 33.3% | -0.33 | 0–1 | — | — | +0.02 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 31 | 2016 | 1470 | 94.8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | — | 1571 | 116.9 | -0.66 | -2.15 | 0.898 | 47.9% | +54 | -46 | — | 38.7% | -0.64 | 8–23 (26%) | 6–11 (35%) | 88.9 | +0.72 | — | 1621 | 114.0 | -2.13 | -0.50 | 0.916 | 48.1% | +15 | -3 | +98 | 36.5% | -0.88 | 13–16 (45%) | 10–5 (67%) | 102.5 | +1.60 |
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 |
|---|---|---|---|---|---|
| Katarina Srebotnik | 0 | 4 | 4 | Aug 31, 2006 | H2H |
| Vera Dushevina | 1 | 2 | 3 | Feb 12, 2010 | H2H |
| Anastasia Rodionova | 3 | 0 | 3 | Aug 27, 2008 | H2H |
| Sania Mirza | 2 | 0 | 2 | Sep 23, 2010 | H2H |
| Lourdes Domínguez Lino | 0 | 2 | 2 | Jan 21, 2009 | H2H |
| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Nathalie Dechy | 1 | 3 | 4 | Jan 3, 2008 | H2H |
| Anna Chakvetadze | 1 | 2 | 3 | May 17, 2007 | H2H |
| Vera Dushevina | 1 | 1 | 2 | Feb 17, 2009 | H2H |
| Emilie Loit | 1 | 1 | 2 | May 27, 2008 | H2H |
| Agnes Szavay | 0 | 2 | 2 | May 14, 2008 | H2H |