Serena Williams plays tennis.
Serena Williams . On the sixth occasion , she held the ranking for 186 consecutive weeks , tying the record set by Steffi Graf for the most consecutive weeks as world no. 1 by a female tennis player . 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 .