With 19 aces, gutsy comeback, Serena reaches Wimbledon semis

United States’ Alison Riske reacts after losing a point during a women’s quarterfinal match against United States’ Serena Williams on day eight of the Wimbledon Tennis Championships in London, Tuesday, July 9, 2019. (AP Photo/Kirsty Wigglesworth)

United States’ Serena Williams celebrates after winning a point against United States’ Alison Riske during a women’s quarterfinal match on day eight of the Wimbledon Tennis Championships in London, Tuesday, July 9, 2019. (AP Photo/Kirsty Wigglesworth)

United States’ Serena Williams falls attempting to return the ball to United States’ Alison Riske during a women’s quarterfinal match on day eight of the Wimbledon Tennis Championships in London, Tuesday, July 9, 2019. (AP Photo/Kirsty Wigglesworth)

United States’ Serena Williams receives medical care during a women’s quarterfinal match against United States’ Alison Riske on day eight of the Wimbledon Tennis Championships in London, Tuesday, July 9, 2019. (AP Photo/Kirsty Wigglesworth)

Britain’s Andy Murrayspeaks and United States’ Serena Williams hit a high five after winning a point during a mixed doubles match on day eight of the Wimbledon Tennis Championships in London, Tuesday, July 9, 2019. (AP Photo/Kirsty Wigglesworth)

United States’ Serena Williams celebrates defeating United States’ Alison Riske during a women’s quarterfinal match on day eight of the Wimbledon Tennis Championships in London, Tuesday, July 9, 2019. (AP Photo/Kirsty Wigglesworth)

WIMBLEDON, England — Slowed by a balky ankle, trailing by a service break in the third set of her Wimbledon quarterfinal, Serena Williams appeared to be in trouble Tuesday against an opponent playing the tournament of her life.

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