How many times has Serena Williams won US Open?
Serena Williams has won US Open singles titles four times now: 1999, 2002, 2008 and 2012. She also won US Open doubles titles twice with her sister Venus Williams in 1999 and 2009.
Serena won her first US Open singles title when she was only 18 years old. She became World No. 1 in 2002 when she was 21 years old. So far, Serena has won over $40 million in prize money, which makes her the 1st all-time among female tennis players.