Phil Hill is the only American born Formula One champion. He won with Ferrari in 1961 after having had a season-long battle for top spot with teammate Wolfgang von Trips. Hill's win at the 1961 Italian Grand Prix secured the drivers' title for the American but, after passing the chequered flag and returning to the pits, he discovered that his close rival had died in an accident during the race. The collision between von Trips and Jim Clark's Lotus also killed 15 spectators – Hill's victory coincided with the worst tragedy in Formula One history. During his Formula One career Hill started 48 races and won just three events, the joint lowest of any world champion alongside Briton Mike Hawthorn.