FILE - In this Friday, Sept. 7, 2012 file photo Esther Vergeer of the Netherlands holds her gold medal for winning the women's wheelchair tennis final at the 2012 Paralympics games in L

 

              FILE - In this Friday, Sept. 7, 2012 file photo Esther Vergeer of the Netherlands holds her gold medal for winning the women
FILE - In this Friday, Sept. 7, 2012 file photo Esther Vergeer of the Netherlands holds her gold medal for winning the women's wheelchair tennis final at the 2012 Paralympics games in London. Wheelchair tennis star Esther Vergeer says she is retiring immediately, bringing to an end one of sport's longest winning streaks and a career peppered with Grand Slam and Paralympic titles. Vergeer tweeted on Tuesday Feb. 12, 2013, that it was a special day as she has "officially stopped tennis." (AP Photo/Alastair Grant, File)