LOS ANGELES: Dustin Johnson warmed up for the US Open by reclaiming the world number one ranking on Sunday (Monday in Manila), cruising to a six-shot victory at the Fedex St. Jude Classic.

Johnson, who started the day alongside Andrew Putnam at the top of the leaderboard, held his nerve to close with a four-under-par 66 at TPC Southwind in Memphis, Tennessee.