Shahar Peer, the most successful Israeli woman to play the WTA Tour, announced her retirement at age 20.

Peer, who reached a career-high rank of No. 11 in January of 2011, has been bothered by a chronic shoulder injury.

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"I want to share with you one of the hardest decisions I have had to make in my life," Peer wrote in a Facebook post. "After 23 years, in which 13 of those years I was an international professional tennis player, I am retiring :-)

"I made this decision following a chronic inflammation in my shoulder, that has been lasting for over two years, and prevents me from competing at the high level that I am used to and expect from myself. At the same time, I lost my desire for the game of tennis and the intense way of life I have lived since I was 6.5 years old."



Peer won five WTA titles, reached the 2007 Australian Open and US Open quarterfinals and posted a 28-15 singles record representing Israel in Fed Cup.

Australian Open fans may well remember the 2007 quarterfinals when Peer pushed Serena Williams in a fierce three-set battle before the American prevailed 3-6, 6-2, 8-6.