According to the Associated Press, "Total prize money at the U.S. Open will top $20 million for the first time this year, with the men’s and women’s singles champions each earning a tournament-record $1.5 million... The overall payout of $20.6 million is $1 million more than in 2007, matching the largest single-year jump in the hard-court Grand Slam tournament’s history, the U.S. Tennis Association announced Tuesday."
So does that make this the richest tourney in all of tennis now?
US Open ups total prize money, champions' pay - Tennis - Yahoo! Sports