Women’s singles

(Left): Serena Williams of the United States reacts against Flavia Pennetta of Italy during their women's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Chris Trotman/Getty Images for USTA)

(Right): Novak Djokovic of Serbia serves against Andy Murray of Great Britain during their men's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Julian Finney/Getty Images)

Serena Williams, Novak Djokovic Off To US Open Semifinals

After a bad-as-can-be start, dropping the first three games, Serena Williams quickly turned things around and stretched her U.S. Open winning streak to 19 matches to get back to the semifinals.

09/03/2014

(Photo by Elsa/Getty Images)

Azarenka Holds Off Defending Champ Stosur, Advances To Semifinal

Top-ranked Victoria Azarenka was pushed to the limit by defending champion Sam Stosur before winning in a third-set tiebreaker at the U.S. Open quarterfinals on Tuesday.

09/04/2012