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LONDON -- Looking back, it seems perfectly understandable that it took Serena Williams some time to settle her nerves in her first singles match in nearly four years.
Rennae Stubbs, one of Williams' coaches, pinpointed a moment about an hour into the 44-year-old's loss to an opponent less than half her age earlier this week at Wimbledon.
"I noticed in the middle of the second set her take a big sort of deep breath, and I actually turned around to Venus [Williams] and said, 'Oh I think she just relaxed,'" Stubbs said.
In an interview with The Associated Press on Saturday, Stubbs revealed that she first started coaching Williams again in March and immediately noticed that the 23-time Grand Slam champion could still play.