Serena Williams is a Grand Slam winner.
Serena Williams . She is also the most recent player , together with her sister Venus Williams , to have held all four Grand Slam women 's doubles titles simultaneously ( 2009 -- 10 ) . Her total of 23 Grand Slam singles titles marks the record for the most Grand Slam wins by a tennis player in the Open Era , and is second on the all-time list behind Margaret Court ( 24 ) . She is also the only tennis player to have won 10 Grand Slam singles titles in two separate decades . She has won an all-time record of 13 Grand Slam singles titles on hardcourt .