 He notched another top-10 finish in April at the RBC Heritage, a tie for ninth.On July 14 (about two weeks before his 20th birthday) Spieth won the John Deere Classic on the fifth hole of a three-way, sudden-death playoff against defending champion Zach Johnson and David Hearn.He became the fourth youngest PGA Tour winner and the first teenager to do so since Ralph Guldahl won the Santa Monica Open in 1931.