Bill Haas hit a wedge into the water and made triple bogey on the 11th hole to fall five shots behind. Four holes and three birdies later, he had the outright lead. He was helped by Andres Romero, who squandered a three-shot lead in two holes by hitting his tee shot into a creek.
With all that action, James Driscoll must have felt as if he missed out on all the fun. All he did was post his third straight round in the 60s to join the leaders.
Castro put the perfect finishing touch on a theatrical afternoon by taking his penalty drop from the water on No. 18 and chipping in from 80 feet for par. That enabled him to salvage an even-par 71 and claim a share of the lead with Haas (68), Driscoll (68) and Romero, who closed with six pars for a 70.
"Saving a bogey would have been huge," Castro said. "Making a par is just a bonus."
They were at 7-under 206, which means next to nothing not with 10 players separated by three shots going into the final round, with seven of those players looking for their first PGA Tour victory.
U.S. Women's Open
Inbee Park is one round from making history by winning the first three majors of the year.
The top-ranked Park has a four-stroke lead through three rounds at the U.S. Women's Open in Southampton, N.Y. She shot 1-under 71 on Saturday in harsh conditions at Sebonack and is 10 under for the tournament.
Fellow South Korean I.K. Kim shot 73 to remain in second but lost two strokes to Park. With the wind whipping, the greens fast and the pin placements tricky, Park was the only player to shoot under par for the round.
Fred Couples shot an 8-under 62 to take a four-shot lead over John Huston at the midway point of the Senior Players Championship in Pittsburgh.
Couples finished the rain-delayed second round at Fox Chapel Golf Club early Saturday morning with a 36-hole score to 12 under. It's the second straight year the Hall of Famer has taken the lead at the midway point of one of the Champions Tour's biggest events.