H2H data updated: 2026-09-03 00:00 UTC

Juan Monaco vs Nicolas Kiefer H2H: 1-0

Juan Monaco holds a 1–0 lead over Nicolas Kiefer in their ATP head-to-head. Across 1 main-draw meeting, Juan Monaco leads 1–0 on clay. Most recently, Juan Monaco won the 2009 Italian Open first round 6-2 6-3.

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Juan Monaco
ARG Age 42 Right-Handed 185 cm / 6'1"
H2H
1 – 0
1 main draw meetings
Nicolas Kiefer
GER Age 49 Right-Handed 183 cm / 6'0"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Juan Monaco #58 6-2 6-3 Nicolas Kiefer #30 Match data Apr 29, 2009* R64 Italian Open Masters 1000 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
Juan Monaco #226 #10 2,775 2,052 327 260 55.7% 0 0 0 2 7 9
Nicolas Kiefer #720 #4 2,447 1,995 347 255 57.6% 0 0 0 1 5 6

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 Juan Monaco Nicolas Kiefer
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
16 — — — — — — — 1994 0–1 0.0% — 1,489 0 0
17 — — — — — — — 1995 3–3 50.0% #206 1,527 0 0
18 — — — — — — — 1996 7–9 43.8% #128 1,563 0 0
19 — — — — — — — 1997 26–16 61.9% #32 1,799 0 1
20 2004 16–12 57.1% #73 1,661 0 0 1998 31–25 55.4% #35 1,792 0 1
21 2005 18–25 41.9% #85 1,577 0 0 1999 53–21 71.6% #6 1,922 0 4
22 2006 18–23 43.9% #69 1,639 0 0 2000 30–16 65.2% #20 1,900 0 6
23 2007 41–19 68.3% #23 1,864 0 3 2001 26–25 51.0% #42 1,763 0 6
24 2008 27–21 56.2% #46 1,760 0 3 2002 19–24 44.2% #72 1,717 0 6
25 2009 34–24 58.6% #30 1,851 0 3 2003 19–17 52.8% #58 1,727 0 6
26 2010 28–18 60.9% #26 1,837 0 3 2004 34–20 63.0% #21 1,886 0 6
27 2011 26–24 52.0% #26 1,940 0 3 2005 31–22 58.5% #22 1,862 0 6
28 2012 37–18 67.3% #12 1,935 0 7 2006 14–8 63.6% #48 1,863 0 6
29 2013 22–21 51.2% #42 1,822 0 8 2007 19–12 61.3% #49 1,906 0 6
30 2014 22–19 53.7% #62 1,864 0 8 2008 22–17 56.4% #38 1,889 0 6
31 2015 21–19 52.5% #53 1,812 0 8 2009 12–16 42.9% #116 1,762 0 6
32 2016 17–14 54.8% #65 1,875 0 9 2010 1–3 25.0% #722 1,722 0 6
33 2017 0–3 0.0% #226 1,814 0 9 — — — — — — —

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 Juan Monaco Nicolas Kiefer
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 %
16 — — — — — — — — — — — — — — — — — 1994 — — — — — — — — — — — — 0 1 1 0.0%
17 — — — — — — — — — — — — — — — — — 1995 — — — — — — — — — — — — 3 3 6 50.0%
18 — — — — — — — — — — — — — — — — — 1996 1 2 3 33.3% 3 4 7 42.9% 1 1 2 50.0% 2 2 4 50.0%
19 — — — — — — — — — — — — — — — — — 1997 7 5 12 58.3% 3 4 7 42.9% 5 2 7 71.4% 11 5 16 68.8%
20 2004 2 3 5 40.0% 14 8 22 63.6% — — — — 0 1 1 0.0% 1998 24 15 39 61.5% 4 4 8 50.0% 2 3 5 40.0% 1 3 4 25.0%
21 2005 1 8 9 11.1% 14 14 28 50.0% 0 1 1 0.0% 3 2 5 60.0% 1999 41 15 56 73.2% 2 2 4 50.0% 6 1 7 85.7% 4 3 7 57.1%
22 2006 3 8 11 27.3% 15 15 30 50.0% — — — — — — — — 2000 27 11 38 71.1% 1 3 4 25.0% 2 2 4 50.0% — — — —
23 2007 12 9 21 57.1% 28 8 36 77.8% 0 1 1 0.0% 1 1 2 50.0% 2001 11 13 24 45.8% 6 6 12 50.0% 4 2 6 66.7% 5 4 9 55.6%
24 2008 9 10 19 47.4% 18 10 28 64.3% — — — — 0 1 1 0.0% 2002 10 15 25 40.0% 1 5 6 16.7% 7 3 10 70.0% 1 1 2 50.0%
25 2009 7 10 17 41.2% 27 13 40 67.5% 0 1 1 0.0% — — — — 2003 14 11 25 56.0% 1 3 4 25.0% 4 3 7 57.1% — — — —
26 2010 14 10 24 58.3% 14 8 22 63.6% — — — — — — — — 2004 30 14 44 68.2% 2 4 6 33.3% 2 2 4 50.0% — — — —
27 2011 15 12 27 55.6% 11 11 22 50.0% 0 1 1 0.0% — — — — 2005 15 13 28 53.6% 6 4 10 60.0% 2 2 4 50.0% 8 3 11 72.7%
28 2012 12 10 22 54.5% 22 6 28 78.6% 3 2 5 60.0% — — — — 2006 8 4 12 66.7% 6 4 10 60.0% — — — — — — — —
29 2013 2 7 9 22.2% 18 12 30 60.0% 2 2 4 50.0% — — — — 2007 17 9 26 65.4% — — — — 2 3 5 40.0% — — — —
30 2014 7 7 14 50.0% 15 12 27 55.6% — — — — — — — — 2008 12 11 23 52.2% 5 4 9 55.6% 5 2 7 71.4% — — — —
31 2015 6 5 11 54.5% 14 12 26 53.8% 1 2 3 33.3% — — — — 2009 4 7 11 36.4% 7 7 14 50.0% 1 2 3 33.3% — — — —
32 2016 6 7 13 46.2% 10 6 16 62.5% 1 1 2 50.0% — — — — 2010 — — — — 0 1 1 0.0% 1 2 3 33.3% — — — —
33 2017 0 2 2 0.0% 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — — — — — —
Career — 96 108 204 47.1% 220 136 356 61.8% 7 11 18 38.9% 4 5 9 44.4% — 221 145 366 60.4% 47 55 102 46.1% 44 30 74 59.5% 35 25 60 58.3%

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 578/587 of Juan Monaco's and 537/601 of Nicolas Kiefer'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 Juan Monaco Nicolas Kiefer
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%
17 — —/— — — — — — — — — — 1995 6/6 4.7 2.3 61.5% 72.6% 51.3% 62.7% 44.1% 64.8% 36.3%
18 — —/— — — — — — — — — — 1996 11/16 6.1 2.5 52.2% 76.6% 47.8% 53.2% 49.7% 62.7% 39.8%
19 — —/— — — — — — — — — — 1997 37/42 7.9 3.5 55.2% 77.0% 48.3% 60.5% 52.5% 64.1% 36.7%
20 2004 28/28 1.9 2.5 66.9% 63.4% 48.9% 47.3% 47.8% 58.5% 41.8% 1998 49/56 6.2 4.7 53.7% 74.8% 47.8% 55.1% 44.4% 62.5% 39.0%
21 2005 42/43 2.0 2.1 65.5% 63.7% 50.7% 51.2% 43.6% 58.9% 37.4% 1999 56/74 6.6 4.3 51.5% 75.7% 53.2% 61.8% 43.5% 64.7% 40.4%
22 2006 41/41 1.9 1.8 64.0% 65.6% 52.2% 56.6% 40.4% 60.9% 40.3% 2000 38/46 6.4 4.3 52.7% 74.9% 52.3% 61.7% 48.3% 64.3% 40.1%
23 2007 60/60 3.2 1.9 65.2% 69.0% 56.6% 57.3% 50.6% 64.7% 41.1% 2001 44/51 6.3 4.1 50.3% 71.1% 48.8% 54.0% 50.7% 60.0% 40.0%
24 2008 46/48 2.7 1.9 64.8% 65.5% 51.6% 50.7% 43.9% 60.1% 41.8% 2002 40/43 6.2 4.5 52.6% 74.1% 47.8% 58.8% 50.7% 61.5% 37.6%
25 2009 58/58 1.9 2.0 68.0% 66.6% 53.2% 52.0% 48.6% 62.4% 42.9% 2003 36/36 6.5 3.8 50.8% 73.1% 49.9% 58.1% 44.7% 61.8% 37.4%
26 2010 46/46 3.4 2.5 65.3% 68.0% 52.0% 58.2% 45.8% 62.4% 40.7% 2004 51/54 7.3 3.8 54.9% 77.8% 48.4% 61.1% 41.4% 64.5% 38.7%
27 2011 49/50 2.0 1.9 66.1% 66.1% 52.9% 57.1% 46.6% 61.4% 40.7% 2005 52/53 7.6 3.8 53.4% 74.2% 51.4% 56.4% 51.3% 63.6% 40.9%
28 2012 53/55 1.7 2.0 67.7% 67.4% 52.8% 55.8% 45.5% 62.4% 43.2% 2006 21/22 7.4 4.0 51.7% 72.0% 50.1% 59.5% 43.3% 61.3% 40.2%
29 2013 43/43 2.0 1.9 69.0% 65.2% 52.2% 50.8% 49.4% 61.4% 42.4% 2007 30/31 6.7 2.5 57.0% 79.9% 51.6% 64.6% 33.9% 67.8% 38.1%
30 2014 41/41 1.9 1.6 69.8% 64.7% 54.8% 49.0% 45.9% 61.7% 41.1% 2008 34/39 7.2 2.4 53.6% 76.3% 51.9% 55.4% 44.9% 64.9% 39.6%
31 2015 40/40 2.2 1.4 71.9% 64.4% 51.7% 59.5% 41.9% 60.6% 39.9% 2009 28/28 7.7 3.9 52.0% 75.0% 47.3% 62.9% 45.8% 61.9% 35.4%
32 2016 28/31 1.9 1.1 74.5% 64.0% 55.4% 54.8% 39.6% 61.4% 40.7% 2010 4/4 11.3 6.5 51.8% 77.7% 47.3% 55.7% 31.0% 63.0% 28.6%
33 2017 3/3 0.7 0.7 63.6% 60.5% 47.8% 52.2% 59.5% 55.8% 36.6% — —/— — — — — — — — — —
Career — 578/587 2.2 1.9 67.3% 65.9% 52.8% 54.1% 45.8% 61.5% 41.1% — 537/602 6.9 3.8 53.1% 75.1% 49.9% 58.9% 46.0% 63.3% 38.9%

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 Juan Monaco Nicolas Kiefer
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
16 — — — — — — — — — — — — — — — — 1994 1489 97.0 — — — — — — — 0.0% -4.00 — — — +0.05
17 — — — — — — — — — — — — — — — — 1995 1528 117.0 +1.19 -1.22 1.032 51.3% +26 — — 50.0% 0.00 1–1 — — +0.08
18 — — — — — — — — — — — — — — — — 1996 1563 122.9 +0.33 +1.12 1.067 50.9% +8 -24 — 44.1% +0.09 0–1 2–3 (40%) — +0.80
19 — — — — — — — — — — — — — — — — 1997 1799 139.8 +1.52 -0.54 1.021 50.8% -25 -229 -48 55.6% +0.30 14–3 (82%) 8–7 (53%) — +0.64
20 2004 1662 138.6 -2.03 +3.31 1.009 50.1% -131 +91 — 51.5% +0.16 6–3 (67%) 4–4 (50%) — -0.82 1998 1792 151.1 +0.77 +1.69 1.039 50.9% +29 -161 -60 55.6% +0.37 10–11 (48%) 12–8 (60%) — -0.30
21 2005 1577 124.6 -2.76 -0.23 0.912 48.2% -97 +112 — 42.0% -0.54 4–6 (40%) 5–9 (36%) — +0.19 1999 1923 157.7 +2.57 +3.33 1.144 52.6% +23 -302 -126 65.4% +0.99 15–6 (71%) 16–8 (67%) — +0.49
22 2006 1640 125.6 -0.75 +2.74 1.032 50.5% -158 +76 — 46.7% -0.17 3–8 (27%) 5–6 (45%) — -1.40 2000 1900 146.0 +2.09 +2.25 1.124 52.3% +54 -332 -120 61.3% +0.85 9–2 (82%) 7–6 (54%) — -0.03
23 2007 1865 145.9 +1.71 +3.90 1.166 52.7% -172 +120 — 60.6% +0.84 16–6 (73%) 7–12 (37%) — +0.58 2001 1763 149.2 -1.17 +2.22 1.001 50.2% +25 -132 +43 53.5% +0.24 6–10 (38%) 7–5 (58%) — -2.55
24 2008 1760 137.9 -2.43 +3.95 1.049 50.9% -60 +159 — 55.5% +0.11 7–7 (50%) 9–6 (60%) — +1.07 2002 1718 142.5 -0.77 +1.14 0.977 49.8% +5 -139 +119 46.5% -0.05 4–4 (50%) 4–7 (36%) — -0.90
25 2009 1852 157.8 -0.30 +5.86 1.140 52.3% -132 +156 — 57.5% +0.53 6–8 (43%) 7–8 (47%) — -2.94 2003 1727 134.5 +0.10 +0.13 0.980 49.8% +22 -144 +93 48.1% -0.22 6–1 (86%) 3–3 (50%) — +0.36
26 2010 1838 151.8 -0.23 +3.49 1.081 51.6% -17 +79 — 58.8% +0.54 9–8 (53%) 12–6 (67%) — +2.65 2004 1887 148.7 +1.38 +2.62 1.092 51.5% +33 -284 -100 60.2% +0.52 12–6 (67%) 14–7 (67%) — +0.23
27 2011 1940 155.8 -0.55 +4.02 1.054 50.7% +9 -75 — 51.3% +0.12 7–9 (44%) 8–9 (47%) — -0.04 2005 1862 154.9 +1.31 +3.44 1.125 52.2% +10 -139 -50 60.9% +0.77 8–8 (50%) 7–5 (58%) — -1.12
28 2012 1936 158.3 -0.31 +5.86 1.150 52.6% -29 +125 -371 62.2% +0.75 12–7 (63%) 11–7 (61%) — +2.18 2006 1863 140.5 -0.75 +2.34 1.039 50.6% +65 -104 — 60.0% +0.60 8–3 (73%) 7–4 (64%) — +0.78
29 2013 1822 149.5 -1.37 +4.76 1.098 51.6% -49 +142 -201 54.3% +0.49 4–10 (29%) 5–10 (33%) — +2.05 2007 1907 153.1 +4.21 +1.95 1.186 52.7% +55 — -153 65.2% +0.94 1–1 8–5 (62%) — -1.12
30 2014 1864 149.5 -1.50 +3.48 1.073 51.0% -49 +48 — 52.9% +0.15 7–9 (44%) 9–9 (50%) — +0.07 2008 1889 153.4 +2.15 +3.22 1.128 51.9% +5 -79 -37 57.0% +0.37 7–5 (58%) 7–4 (64%) — -1.13
31 2015 1813 155.6 -2.84 +3.06 1.012 50.2% +34 +69 -157 51.0% +0.17 7–6 (54%) 3–11 (21%) — -0.21 2009 1762 145.0 -1.02 -0.24 0.930 49.3% +63 +45 +54 48.5% -0.09 4–4 (50%) 5–4 (56%) — -1.73
32 2016 1875 154.8 -1.63 +3.93 1.056 50.7% -44 +70 — 52.2% +0.15 4–1 (80%) 4–6 (40%) — -1.33 2010 1722 106.1 +0.99 -2.77 0.774 46.3% — — +51 27.3% -1.09 1–1 0–1 — -0.60
33 2017 1814 105.4 -2.73 -1.34 0.827 45.7% — — — 14.3% -2.00 0–1 1–2 (33%) — -0.13 — — — — — — — — — — — — — — — —
Career — 2053 154.7 -0.99 +3.80 1.069 51.1% -64 +97 -261 54.1% +0.29 92–89 (51%) 90–105 (46%) 96.3 +0.33 — 1995 155.1 +1.02 +1.86 1.060 51.2% +25 -127 -17 56.7% +0.45 106–67 (61%) 107–77 (58%) 111.9 -1.01

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.