Defending champion Serena Williams labored into the third round of Wimbledon by coming from a set down to beat fellow American Christina McHale in a thriller on Centre Court.
The world No. 1 was in danger of suffering a sensational defeat in round two on Friday, but battled back to win 6-7 (7), 6-2, 6-4 and set up a meeting with Annika Beck.
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Williams, aiming to equal Steffi Graf's Open Era record of 22 Grand Slam titles, was pushed to the limit as McHale punched above her weight and will surely have to raise her game in order to win a seventh title at the All England Club.