The Williams sisters, Venus and Serena, the greatest sister-act professional tennis has ever seen, succeeded against all odds, and with the help of their visionary parents, made it to the top. Venus, a 7 time grand slam winner (singles) and Serena, 17 time grand slam winner (singles) is ranked World No.1 by the Womens Tennis Association.
Roger Federer (born 1981) is a Swiss professional tennis player who, as of November 2013, is ranked world no. 6 by the ATP. Numerous commentators, pundits, former & current players of the sport have regarded Federer as the greatest tennis player of all time. He holds several men's world records of the Open Era: holding the world no. 1 position for 302 weeks overall; including a 237-consecutive-week stretch at the top from 2004 to 2008...& reaching the Wimbledon final eight times.