“You can’t blame being tired, it just was a long day and I didn’t feel it with the golf swing. Luckily when I did hit a good shot, I was able to make a putt,” he said.
Jordan Spieth, a 19-year-old who began the round sharing the lead with Castro, took an early two-shot advantage after opening the round with two birdies to reach nine under par before he slipped back to four under, three strokes off the pace.
Romero, who had to finish five holes to complete his second round, made four birdies on the front side in the third round to climb to 10 under par and seize a three-stroke lead.
However, the Argentine double-bogeyed the 11th, where Haas also tripled, and bogeyed the 12th to set up the logjam at the top as player fortunes rose and fell throughout the round.
Castro lost the lead he had shared with Spieth heading into the round as he bogeyed the second hole and double-bogeyed the third.
However, he worked his way back with four birdies, including at 16 and 17, as the leaders faltered to make it a foursome atop the leaderboard going to the final round.
Driscoll’s round was relatively dull with five birdies and just two bogeys. He shot 68 and is the only player in the field with three rounds in the 60s.
“It’s not perfect golf, but you don’t really have to play perfect golf sometimes, if you’re just patient and putt well and have a good short game,” Driscoll said.
“There is no let-up. Every hole is long and tough. The rough is up. it’s just 18 tough holes out there,” he said.