Serena Williams is a legend and greatest tennis player of all time, former tennis player Mary Pierce said on Tuesday on the sidelines of Roland Garros Junior Wild Card Series tournament."Serena William is incredible, she is a legend and greatest player of all time and what she is doing today after having baby and being married and now that she has achieved, she does not have to play tennis anymore but she does it because she is passionate about it, she loves it and she wants to rewrite the history of the game and win more grand slams title, so I just think it's incredible what she is doing and what she is still capable to do today," Pierce told ANI.Recently, Sania Mirza staged a winning comeback on the tennis court as she along with her Ukranian partner Nadia Kichenok won the Hobart International tournament. The duo defeated Zhang Shuai and Peng Shuai of China 6-4, 6-4 in the finals.The 45-year-old Pierce said that she had the pleasure of playing with Sania Mirza when she was a ...