Summerhays has a 12-under 201 total on the El Camaleon course.
The 28-year-old former Brigham Young University player won the Nationwide Tour’s 2007 Nationwide Children’s Hospital Invitational as an amateur for his biggest career win.
“Tomorrow, I’m just going to try and do the same things I’ve been doing all week,” Summerhays said. “I’m going to try and hit the driver really well again. My swing feels really good, so I’m picking out good targets. I’m judging the wind correctly and I’m managing it well. ... I’m really looking forward to the opportunity tomorrow to take the lead into the final round of a PGA Tour event and see how I perform.”
Stroud had 68.
Michael Allen, Marc Turnesa and Will Claxton are four strokes back at 8-under. Allen shot 66, Turnesa 67 and Claxton had 71.
Claxton, the second-round leader, had four bogeys Saturday after making just one in the first 36 holes.
LPGA TOUR: In Singapore, Katie Futcher, Angela Stanford and Jenny Shin all shot 1-under par 71s to stay tied for the lead after three rounds of the $1.4 million HSBC Women’s Champions.
Futcher led almost the entire day, jumping ahead with a birdie on the second hole. But a bogey on 18 – just her second of the tournament – allowed Stanford and Shin to regain a share of the lead at 9-under 207.
Shanshan Feng shot 69 and is two shots behind the leaders while Jiyai Shin (70) and Na Yeon Choi (71) are tied with top-ranked Yani Tseng (67) three strokes back at Tanah Merah Country Club.
Tseng struggled during the first two rounds this week, but had four birdies on the front nine Saturday and two more during the rest of the round to put her in contention to win a tournament that has eluded her since it began in 2008.
“I was much better than the last two days,” Tseng said.