Donovan found Chad Barrett in the fourth minute with a lovely through ball before converting from the penalty spot after he was brought down in the area four minutes later.
He then wrapped up the match in the 67th minute with a powerful header from a neat Juan Pablo Angel chip – his performance giving him Player of the Week honours.
Donovan joins five other players who have all scored braces to be nominated by North American Soccer Reporters (NASR).
2011 MLS Players of the Week
Week 1: Omar Bravo (Sporting Kansas City)
Week 2: Javier Morales (Real Salt Lake)
Week 3: Camilo Sanvezzo (Vancouver Whitecaps)
Week 4: David Ferreira (FC Dallas)
Week 5: Luke Rodgers (New York Red Bulls)
Week 6: Landon Donovan (LA Galaxy)