Stallings pegged back by pack

Scott Stallings' bid for a third PGA Tour title was coming under serious threat on the final day of the Humana Challenge in California.

Kevin Chappell, Brian Gay and Nicholas Thompson were among a host of players enjoying stunning fourth rounds on Sunday.

Stallings started the day five shots clear of the field but he had seen that advantage completely disappear by the time he reached the turn today, with Chappell and Gay leading the charge.

Chappell finished his challenge with a brilliant 10-under-par 62 which would have been even better but for a bogey five on his last hole.

That score left him on 22 under for the tournament, two behind joint leaders Stallings and Gay, who were still out on the course.

Gay was in similarly impressive form to Chappell as he recorded eight birdies in his opening 11 holes to move to 24 under overall after 12, leaving him level with Stallings, who was two under after nine.

One shot behind the two pacesetters in third place was Thompson after he moved to eight under through 13.

The only non-American in the top 10 was Swede David Lingmerth, who was seven under after 13 on what is looking to be a remarkable day of low scoring on PGA West Nicklaus course.