The possibility of upsets is a great attraction for an event like the World Golf Championships-Accenture Match Play Championship.
The biggest names can be quickly erased in the first round, and there was some of that on Wednesday.
And there were results like Jonas Blixt, an 11th seed, knocking off sixth-seeded Keegan Bradley, 2 and 1, and 10th-seeded Billy Horschel whipping seventh-seeded Jamie Donaldson, 6 and 5.
But here's a list of the six biggest upsets of the always-volatile opening round.
And don't be surprised if there are more in Thursday's second round.