Tim Henman reached his first US Open quarter-final on Monday when German opponent Nicolas Kiefer retired in the fifth set of their fourth round match.
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The British fifth seed, celebrating his 30th birthday, was 3-0 up in the decider when Kiefer walked towards the umpire's chair holding his right wrist.
Earlier Henman had fallen a set and 3-1 behind before reeling off 10 consecutive games to lead the erratic Kiefer 6-7 6-3 6-1.
The 19th-seeded German, who received a penalty point for smacking a ball into the stands, regained his composure to edge the fourth set in a tiebreak.
But Henman, who had already been pushed to a fifth set twice in the tournament, moved through to play either Olivier Rochus of Belgium or Dominik Hrbaty in the quarter-finals.