Jordan Spieth sits atop packed leaderboard at Pebble Beach

Spieth opened with a bogey-free two-under 34, then thundered home with four birdies in his last six holes.

Jordan Spieth: Is top of the leaderboard at Pebble Beach. Picture: Gregory Bull

Five players including English duo Tom Lewis and Paul Casey are within three shots of the lead at the AT&T Pebble Beach Pro-Am after the second round.

Tied for sixth after the first round 66, Lewis shot a three-under 69 to be in a trio of players sharing fourth place at nine-under, along with Casey, who shot a 67.