Serena has won 18 and Venus 16 including doubles
17 grand slams wow
as of the Australian Open 2010, Venus Williams has 20 Grand Slams. 7 Women's Singles Slams, 11 Women's Doubles Slams and 2 Mixed Slams.
6
She has won 16 grand slams: 7 singles, 7 doubles, and 2 Mixed doubles.
two grand slams
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Nadal has won 14 grand slams.
Serena has won 12 doubles Grand Slams with her sister Venus.
who holds the mariners career record for grand slams how many
Arthur Ashe won three grand slams.
2 grand slams (as on 5 July 2010)
Rafael Nadal has Won 9 Grand Slams!