Serena Williams kept alive her hopes of a record-equalling 24th Grand Slam singles title with a 4-6 6-3 6-2 win over Tsvetana Pironkova in the US Open quarter-finals.
The American six-time champion, 38, struggled early on with the variety of shots from the unranked player who was in her first tournament in three years.
Pironkova tired as Williams took the second and broke twice in the third.
The veteran will now play former world number one Victoria Azarenka, whom she beat in the 2012 and 2013 US Open finals.
Williams said she could not afford another sluggish start if she is to reach her fifth Grand Slam final in three years.
– BBC
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