12 shocking facts about Serena and Venus Williams (With Pictures)

2. Their father was their first trainer. Williams snr. learned tennis from a man named Old Whiskey. He took a liking to the sport and when the sisters were old enough he ‘wrote a 78-page plan, detailing the trajectory for his daughter’s careers and, as soon as they could pick up a racket, got to work.’ (Heavy.com) 

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Under his guidance, Serena won her first grand slam at the US Open in 1999 while Venus tasted grand slam victory at Wimbledon in 2000.