Roger Federer became the first tennis player to reach $50 million in career prize money with his first-round win at the U.S. Open tennis championship. The 28-year-old Swiss, who is guaranteed at least $31,000 by advancing in New York, is seeking his sixth straight U.S. Open title and 16th Grand Slam championship. Here is a quick breakdown of the US Open prizemoney is for 2009: PLAYER BASE PRIZE MONEY POTENTIAL PAYOUT WITH BONUS Winners $ 1,200,000 $ 2,200,000 Runners-Up $ 600,000 $1,100,000 Semifinalists $ 280,000 $ 530,000 Quarterfinalists $ 140,000 $ 265,000 Round of 16 $ 72,000 $ 142,000…