Jörn Renzenbrink (born 17 July 1972) is a retired professional tennis player from Germany.
A right hander, Renzenbrink had his best Grand Slam performance in the 1994 US Open, when he made it into the fourth round. He started his campaign with a straight sets victory over South African Grant Stafford, followed by a four-sets defeat of Morocco's Karim Alami and then a win over Italian Andrea Gaudenzi. In the fourth round he met Jonas Björkman and took him to five sets, but lost.
Renzenbrink never won a singles tournament on the ATP Tour but was runner-up on one occasion, at the 1994 KAL Cup Korea Open. He did however win a doubles title, with fellow German Markus Zoecke, as qualifiers, at the 1995 Hall of Fame Tennis Championships in Newport, Rhode Island.[1]
He won two ATP Challenger Series tournaments during his career, the first in Andorra in 1993 and the other at Aachen in his home country.[2]
Singles: 1 (1 runner-up)
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| Grand Slam Tournaments (0–0)
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| ATP World Tour Finals (0–0)
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| ATP Masters Series (0–0)
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| ATP Championship Series (0–0)
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| ATP World Series (0–1)
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| Result
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W–L
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Date
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Tournament
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Tier
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Surface
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Opponent
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Score
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| Loss
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0–1
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Apr 1994
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Seoul, South Korea
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World Series
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Hard
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 Jeremy Bates
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4–6, 7–6(7–5), 3–6
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Doubles: 1 (1 title)
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| Grand Slam Tournaments (0–0)
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| ATP World Tour Finals (0–0)
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| ATP Masters Series (0–0)
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| ATP Championship Series (0–0)
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| ATP World Series (1–0)
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| Finals by surface
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| Hard (0–0)
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| Finals by setting
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| Outdoors (1–0)
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| Indoors (0–0)
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ATP Challenger and ITF Futures finals
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| ATP Challenger (2–2)
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| Finals by surface
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| Result
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W–L
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Date
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Tournament
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Tier
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Surface
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Opponent
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Score
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| Loss
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0–1
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Aug 1992
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Segovia, Spain
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Challenger
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Hard
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 Guillaume Raoux
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6–7, 6–7
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| Win
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1–1
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Dec 1993
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Andorra la Vella, Andorra
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Challenger
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Hard
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 Ronald Agenor
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6–4, 5–7, 6–3
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| Loss
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1–2
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Dec 1994
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Cologne, Germany
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Challenger
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Hard
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 Karsten Braasch
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4–6, 4–6
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| Win
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2–2
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Nov 1995
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Aachen, Germany
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Challenger
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Carpet
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 Martin Damm
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5–7, 6–3, 6–4
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| Legend
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| ATP Challenger (0–2)
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| ITF Futures (0–0)
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| Finals by surface
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| Hard (0–1)
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| Clay (0–0)
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Key
| W
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F
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SF
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QF
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#R
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RR |
Q#
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DNQ
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A
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NH
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(W) winner; (F) finalist; (SF) semifinalist; (QF) quarterfinalist; (#R) rounds 4, 3, 2, 1; (RR) round-robin stage; (Q#) qualification round; (DNQ) did not qualify; (A) absent; (NH) not held; (SR) strike rate (events won / competed); (W–L) win–loss record.
Germany
Jeremy Bates
Paul Kilderry 
Nuno Marques
Guillaume Raoux
Ronald Agenor
Martin Damm
Diego Nargiso 
Nicolas Pereira
