Serena Williams says 'countdown has begun' to retirement – WBOY.com
Serena Williams elevó el tenis, según Billie Jean King - The New York Times
Serena Williams announces that she is leaving tennis and these are her reasons - Archysport
Serena Williams Exits Wimbledon in the First Round, Again - The New York Times
Serena Williams - Wikipedia
Venus Williams career statistics - Wikipedia
File:Venus Williams at the 2010 US Open 01.jpg - Wikimedia Commons
Serena Williams sets new major target for 2013 - The San Diego Union-Tribune
Serena Williams - Thinking Heads
Serena Downs Venus In Williams Sisters Showdown At US Open
Ranking Serena Williams' 5 Greatest Grand Slam Final Victories | News, Scores, Highlights, Stats, and Rumors | Bleacher Report
Serena Williams' Eastbourne doubles run ends early after injury to Ons Jabeur
File:Serena Williams US Open 2013.jpg - Wikimedia Commons
Serena Williams Retiring From Tennis After U.S. Open
Serena Williams takes to the tennis court with daughter Olympia | CNN
I didn't think Serena Williams started that well', says ATP ace
Serena Williams next match: How to watch Western & Southern Open ahead of US Open farewell | Sporting News
Serena Williams Photostream | Williams tennis, Serena williams tennis, Serena williams photos
Serena Williams edges Victoria Azarenka in French Open's 3rd round – The Denver Post
