PGA Tour: Spieth, Day struggle at Pebble Beach

Two of the top three players in the World Ranking, Jordan Spieth and Jason Day, struggled in the first round of the AT&T Pebble Beach National Pro-Am on Thursday, each shooting one-under-par 71s at Spyglass Hill Golf Course, the most difficult of the three courses in the rotation. They are tied for 65th.

"I'm here grinding this week. This is an important event on courses that are three of my favorite courses in the world, they're so awesome," said Spieth. "You're getting to kind of feel like you're playing a team event while still kind of grinding yourself. It's hard to explain. Maybe it's just these courses bring out the smiles in everybody."

The leader is Chez Reavie, who shot an 8-under par 63 on the Shore Course at Monterey Peninsula Country Club. He leads Freddie Jacobsen, Cameron Smith and Bronson Burgoon by one stroke.

Phil Mickelson, a four-time champion of the event, shot a four-under 68 at Spyglass Hill and is tied for 14th, four shots off the lead.

World no. 7 Justin Rose shot a 66 at Spyglass Hill and is tied for fifth, just two shots off the lead.

Brandt Snedeker, the defending champion and a recent winner of the Farmers Insurance Open, opened with an even-par 72 at Spyglass Hill and is tied for 83th.