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Steffi Graf

Serena Williams withdraws from WTA Finals and China Open

The 2015 season is over for Serena Williams.

The No. 1-ranked Williams withdrew from her final two scheduled tournaments of the year on Thursday, saying she needs time to heal from a series of injuries and the heartbreak of coming up short in a bid for a calendar-year Grand Slam.

Williams hasn't played since losing to Roberta Vinci in the semifinals of the U.S. Open, where she came two matches short of becoming the first player to win all four majors in the same year since Steffi Graf in 1988.

"It's no secret I've played injured most of the year — whether it was my elbow, my knee, or, in the final moments after a certain match in Flushing, my heart,"...