beat (someone) hands down
To defeat or best someone easily or decisively. We were really unprepared for our last game, so the other team beat us hands down. Popular opinion has been that the president beat his opponent hands down in last night's debate.
win (something) hands down
To win something easily or decisively. We were really unprepared for our last game, and the other team won hands down.
win (something)/beat somebody ˌhands ˈdown
win (something)/beat somebody very easily: Holland won the match hands down. The score was five nil.