• Photo Gallery: Arnold Palmer Invitational presented by MasterCard, Round 1

  • Reigning FedExCup champion Billy Horschel started off the first round of the Arnold Palmer Invitational presented by MasterCard with a first round 68, finishing two strokes off the lead, as he seeks his first top 10 finish this season. (Michael Cohen/Getty Images)Reigning FedExCup champion Billy Horschel started off the first round of the Arnold Palmer Invitational presented by MasterCard with a first round 68, finishing two strokes off the lead, as he seeks his first top 10 finish this season. (Michael Cohen/Getty Images)