H2H data updated: 2026-09-01 00:00 UTC

Jan Siemerink vs Daniel Vacek H2H: 1-4

Daniel Vacek holds a 4–1 lead over Jan Siemerink in their ATP head-to-head. Across 5 main-draw meetings, they are tied 1–1 on carpet, while Daniel Vacek leads 2–0 on hard courts. Most recently, Daniel Vacek won the 1998 Long Island round of 16 6-1 4-6 6-3.

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Jan Siemerink
NED Age 56 Left-Handed 183 cm / 6'0"
H2H
1 – 4
5 main draw meetings
Daniel Vacek
CZE Age 55 Right-Handed 190 cm / 6'3"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Daniel Vacek #44 6-1 4-6 6-3 Jan Siemerink #20 Match data Aug 28, 1998* R16 Long Island ATP World Series → modern equivalent ATP 250 Hard
Daniel Vacek #53 6-1 6-4 Jan Siemerink #20 Match data Aug 15, 1998* R16 Cincinnati Open Masters 1000 Hard
Daniel Vacek #72 7-6(3) 7-6(2) Jan Siemerink #21 Match data Mar 6, 1997* R32 ABN AMRO Open World Series → modern equivalent ATP 250 Carpet
Daniel Vacek #53 4-1 (ret.) Jan Siemerink #50 Match data May 11, 1995* R32 Hamburg Open Masters 1000 Clay
Jan Siemerink #43 6-4 6-7(4) 6-1 Daniel Vacek #109 Match data Feb 25, 1993* R32 ABN AMRO Open ATP World Series → modern equivalent ATP 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.

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
Jan Siemerink #987 #14 1,863 1,902 261 262 49.9% 0 0 0 0 4 4
Daniel Vacek #1,133 #26 1,151 1,821 171 220 43.7% 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.

Age Jan Siemerink Daniel Vacek
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
20 1990 5–4 55.6% #135 1,541 0 0 1991 1–3 25.0% #470 1,490 0 0
21 1991 30–21 58.8% #26 1,756 0 1 — — — — — — —
22 1992 22–27 44.9% #57 1,741 0 1 1993 13–22 37.1% #114 1,559 0 0
23 1993 24–25 49.0% #53 1,669 0 1 1994 25–27 48.1% #45 1,732 0 0
24 1994 16–19 45.7% #81 1,686 0 1 1995 30–31 49.2% #27 1,797 0 0
25 1995 37–29 56.1% #21 1,768 0 1 1996 23–29 44.2% #71 1,692 0 0
26 1996 35–28 55.6% #15 1,861 0 2 1997 19–26 42.2% #53 1,669 0 0
27 1997 18–27 40.0% #78 1,738 0 2 1998 25–29 46.3% #50 1,671 0 0
28 1998 38–24 61.3% #19 1,809 0 4 1999 29–31 48.3% #43 1,740 0 0
29 1999 17–25 40.5% #88 1,653 0 4 2000 4–13 23.5% #238 1,628 0 0
30 2000 7–14 33.3% #104 1,573 0 4 2001 2–7 22.2% #393 1,595 0 0
31 2001 12–17 41.4% #127 1,563 0 4 2002 0–2 0.0% #749 1,577 0 0
32 2002 0–2 0.0% #438 1,531 0 4 — — — — — — —

Surface Results by Age

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 Jan Siemerink Daniel Vacek
Yr HardClayGrassCarpet Yr HardClayGrassCarpet
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 1990 3 2 5 60.0% — — — — 1 1 2 50.0% 1 1 2 50.0% 1991 0 2 2 0.0% 1 1 2 50.0% — — — — — — — —
21 1991 16 7 23 69.6% 0 4 4 0.0% 1 3 4 25.0% 13 7 20 65.0% — — — — — — — — — — — — — — — — —
22 1992 10 12 22 45.5% 2 6 8 25.0% 1 2 3 33.3% 9 7 16 56.3% 1993 7 9 16 43.8% 4 6 10 40.0% 1 3 4 25.0% 1 4 5 20.0%
23 1993 11 13 24 45.8% 4 4 8 50.0% 1 3 4 25.0% 8 5 13 61.5% 1994 10 11 21 47.6% 3 6 9 33.3% 3 3 6 50.0% 9 7 16 56.3%
24 1994 9 11 20 45.0% 1 2 3 33.3% — — — — 6 6 12 50.0% 1995 11 11 22 50.0% 4 7 11 36.4% 1 3 4 25.0% 14 10 24 58.3%
25 1995 20 12 32 62.5% 7 6 13 53.8% 3 3 6 50.0% 7 8 15 46.7% 1996 10 11 21 47.6% 4 5 9 44.4% 3 3 6 50.0% 6 10 16 37.5%
26 1996 14 14 28 50.0% 2 4 6 33.3% 7 2 9 77.8% 12 8 20 60.0% 1997 6 11 17 35.3% 2 5 7 28.6% 1 3 4 25.0% 10 7 17 58.8%
27 1997 10 12 22 45.5% 4 5 9 44.4% 1 3 4 25.0% 3 7 10 30.0% 1998 17 17 34 50.0% 3 2 5 60.0% 2 3 5 40.0% 3 7 10 30.0%
28 1998 18 11 29 62.1% 0 4 4 0.0% 8 3 11 72.7% 12 6 18 66.7% 1999 20 17 37 54.1% 1 6 7 14.3% 6 3 9 66.7% 2 5 7 28.6%
29 1999 10 12 22 45.5% 1 4 5 20.0% 2 3 5 40.0% 4 6 10 40.0% 2000 4 9 13 30.8% 0 4 4 0.0% — — — — — — — —
30 2000 2 8 10 20.0% 4 3 7 57.1% 1 3 4 25.0% — — — — 2001 2 5 7 28.6% — — — — 0 2 2 0.0% — — — —
31 2001 6 6 12 50.0% 4 7 11 36.4% 2 4 6 33.3% — — — — 2002 0 2 2 0.0% — — — — — — — — — — — —
32 2002 0 1 1 0.0% 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — — — — — —
Career — 129 121 250 51.6% 29 50 79 36.7% 28 30 58 48.3% 75 61 136 55.1% — 87 105 192 45.3% 22 42 64 34.4% 17 23 40 42.5% 45 50 95 47.4%

Performance Progression by Age

Seasons are aligned by the age each player spent most of that calendar year. Detailed serve and return statistics available for 448/514 of Jan Siemerink's and 346/391 of Daniel Vacek'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 Jan Siemerink Daniel Vacek
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 — —/— — — — — — — — — — 1991 4/4 3.8 2.8 61.6% 71.4% 42.5% 43.4% 19.0% 59.1% 34.1%
21 1991 48/51 7.0 5.1 52.3% 75.3% 53.3% 58.8% 44.6% 64.8% 37.8% — —/— — — — — — — — — —
22 1992 42/49 6.2 4.2 54.6% 72.8% 50.4% 63.1% 36.0% 62.7% 34.7% 1993 32/35 6.8 4.4 60.0% 72.6% 54.6% 58.6% 34.4% 65.5% 31.8%
23 1993 41/49 6.4 4.0 56.6% 76.6% 50.8% 62.6% 44.2% 65.2% 35.5% 1994 49/52 7.0 5.4 59.5% 74.6% 50.5% 56.6% 36.0% 65.1% 34.7%
24 1994 34/35 6.1 4.0 60.1% 75.5% 50.2% 63.0% 40.6% 65.5% 36.4% 1995 50/61 8.1 4.3 59.9% 75.7% 51.4% 61.3% 37.4% 65.9% 35.7%
25 1995 61/66 5.4 3.4 59.5% 73.7% 53.2% 64.8% 37.0% 65.3% 35.9% 1996 48/52 7.3 5.1 56.7% 76.2% 49.0% 53.1% 39.3% 64.6% 33.5%
26 1996 61/63 6.5 5.1 55.7% 75.7% 51.2% 65.5% 39.7% 64.8% 35.9% 1997 41/45 8.2 6.8 51.8% 76.0% 46.0% 59.0% 36.2% 61.5% 34.9%
27 1997 38/45 7.7 5.0 56.5% 74.2% 52.0% 66.9% 45.4% 64.4% 35.1% 1998 46/54 7.0 5.1 56.6% 74.9% 47.3% 61.9% 39.4% 62.8% 35.5%
28 1998 48/62 8.3 4.6 58.0% 77.7% 52.2% 65.2% 43.2% 66.9% 34.3% 1999 50/60 4.7 4.6 56.5% 70.1% 47.7% 64.0% 37.1% 60.1% 36.2%
29 1999 30/42 5.9 5.1 55.5% 73.7% 50.1% 56.9% 38.4% 63.1% 32.6% 2000 15/17 4.2 5.4 53.6% 64.8% 40.6% 42.9% 30.9% 53.9% 30.4%
30 2000 17/21 6.5 5.8 54.9% 73.6% 46.0% 64.2% 28.0% 61.4% 33.6% 2001 9/9 6.8 3.4 54.2% 67.3% 50.2% 50.6% 27.2% 59.5% 29.2%
31 2001 26/29 7.2 5.9 52.8% 75.6% 48.7% 56.6% 34.2% 62.7% 32.1% 2002 2/2 5.0 2.5 58.4% 71.8% 37.5% 45.7% 36.5% 57.6% 36.6%
32 2002 2/2 7.0 6.0 54.2% 76.2% 50.9% 42.9% 50.0% 64.8% 27.2% — —/— — — — — — — — — —
Career — 448/523 6.6 4.6 56.3% 75.1% 51.3% 62.8% 40.0% 64.6% 35.2% — 346/391 6.8 5.0 57.1% 73.7% 48.8% 58.1% 36.5% 63.0% 34.4%

Advanced Statistics Comparison by Age

Seasons are aligned by the age each player spent most of that calendar year. Metrics are precomputed from eligible main-draw results; point-stat values use the available detailed sample. 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 Jan Siemerink Daniel Vacek
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 1990 1541 108.1 — — — — +36 — — 52.6% -0.05 1–0 — — +1.03 1991 1490 102.2 -1.04 -0.09 0.834 46.2% — — — 22.2% -1.67 — 1–0 — +0.10
21 1991 1757 143.1 +3.22 -0.58 1.074 51.5% +40 -248 -209 55.7% +0.44 11–10 (52%) 14–13 (52%) — -0.39 — — — — — — — — — — — — — — — —
22 1992 1741 139.7 +1.78 -2.28 0.929 49.2% +31 -264 -201 43.8% -0.47 7–7 (50%) 10–6 (63%) — -2.48 1993 1560 126.4 +2.79 -4.51 0.922 49.1% -2 +9 -4 41.1% -0.61 3–7 (30%) 7–9 (44%) — +0.29
23 1993 1669 136.6 +2.63 -1.58 1.020 50.4% +20 -120 -143 50.0% +0.11 8–11 (42%) 13–14 (48%) — +0.60 1994 1732 143.4 +3.08 -2.24 0.992 49.9% -14 -131 -90 47.5% -0.12 12–9 (57%) 13–15 (46%) — -1.41
24 1994 1686 139.2 +3.09 -0.26 1.054 50.9% -6 -131 — 48.8% +0.01 3–7 (30%) 8–8 (50%) — -1.29 1995 1798 148.9 +3.89 -1.17 1.046 50.7% +14 -171 -195 48.7% +0.03 10–11 (48%) 15–18 (45%) — -1.99
25 1995 1768 149.5 +3.33 -1.32 1.035 50.6% -12 -116 -191 54.4% +0.22 11–8 (58%) 12–7 (63%) — -2.79 1996 1692 140.7 +2.32 -3.52 0.945 49.3% +10 -77 -50 45.5% -0.25 12–11 (52%) 14–11 (56%) — -2.02
26 1996 1862 148.8 +2.53 -0.73 1.019 50.6% -13 -212 -147 54.0% +0.10 11–10 (52%) 30–16 (65%) — -1.35 1997 1670 134.8 -0.60 -1.91 0.906 48.1% +38 -50 -60 41.8% -0.61 6–7 (46%) 13–12 (52%) — -0.33
27 1997 1739 137.7 +1.77 -1.30 0.987 50.2% +24 -75 -78 43.8% -0.28 7–12 (37%) 12–13 (48%) — -0.14 1998 1672 143.3 +0.67 -1.11 0.956 49.4% +16 -20 -40 48.1% -0.21 6–8 (43%) 13–10 (57%) — +0.31
28 1998 1810 145.1 +3.80 -2.09 1.038 50.9% +13 -234 -13 57.3% +0.46 15–7 (68%) 14–16 (47%) — -0.24 1999 1741 133.9 -1.09 -1.27 0.909 48.6% +1 -191 -65 46.2% -0.17 9–4 (69%) 7–11 (39%) — +0.89
29 1999 1654 132.5 +1.25 -2.98 0.884 48.1% +56 -141 +72 42.6% -0.49 6–7 (46%) 7–9 (44%) — +0.21 2000 1629 122.6 -4.37 -4.38 0.659 42.4% +53 -125 — 27.5% -2.08 1–2 (33%) 4–1 (80%) — -1.16
30 2000 1573 115.4 -0.13 -3.10 0.870 47.9% +66 -41 +96 37.0% -0.83 3–5 (38%) 4–2 (67%) — +0.50 2001 1595 122.1 -0.70 -2.81 0.721 45.3% +49 — — 23.8% -1.67 — 1–2 (33%) — -0.96
31 2001 1564 122.8 +0.45 -4.28 0.859 47.7% +102 -52 +33 38.7% -0.73 6–4 (60%) 6–11 (35%) — -0.11 2002 1578 111.7 +0.38 -0.21 0.865 46.5% — — — 16.7% -1.17 — 0–2 — -0.38
32 2002 1531 102.5 -1.57 -0.36 0.773 46.8% — — — 20.0% -1.20 0–1 1–3 (25%) — -0.01 — — — — — — — — — — — — — — — —
Career — 1902 144.8 +2.44 -1.62 0.993 50.1% +20 -133 -71 49.5% -0.03 89–89 (50%) 131–118 (53%) 104.4 -1.24 — 1822 143.7 +1.22 -2.21 0.930 48.9% +12 -96 -70 44.3% -0.37 59–59 (50%) 88–91 (49%) 102.9 -1.71

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.