Serena Williams competes in women's singles and doubles.
Serena Williams . The Women 's Tennis Association ( WTA ) has ranked her world no. 1 in singles on eight occasions , from 2002 to 2017 . She also holds an all-time record for the most singles matches won at the Grand Slams ( man or woman ) with 316 matches ( through the 2017 Australian Open ) . Serena has also won four Olympic gold medals , one in women 's singles and three in women 's doubles -- an all-time record shared with her sister , Venus .