#4 Marat Safin and Dinara Safina
Both Marat Safin and Dinara Safina have had successful tennis careers and have been World No.1 at some point in their careers. Both players owe their success to their mother Rauza Islanova who is a popular tennis coach in Russia and was their first trainer. Islanova was Safina’s full-time coach till 2003.Marat Safin went on to win two Grand Slam titles at the 2000 US Open and the 2005 Australian Open and was the ATP World No.1 for a total of nine weeks. Dinara Safina never won a Grand Slam but at her prime, was a very formidable competitor. She reached three Grand Slam finals and was at the top of the WTA rankings for 26 weeks.
Venus Williams and Father Richard recall one match that 7-time Grand Slam champion "should have won"