Los Angeles - South Korean Kang Sung's third-round 71 was good enough for a three-shot lead on Saturday after American Rickie Fowler's late stumble at the US PGA Houston Open.
Kang, a 29-year-old chasing a first US PGA Tour title that would give him a late invitation to next week's Masters, couldn't match his sizzling 63 of Friday.
But his one-under effort for a 17-under-par total of 199 still left him a slight cushion going into the final round.
Kang's round of four birdies and three bogeys helped him withstand the pressure applied by Fowler, who had eight birdies in his first 14 holes to grab a share of the lead before finishing with a bogey at 17 and a double-bogey at the last.
Fowler settled for a 67 for 202 -- one stroke in front of American Russell Henley, who signed for a 69.
Kang, who started the week ranked 202nd in the world, began the round with an impressive six-shot lead, but Fowler wasted little time in eating into that.
After birdies at the third and fifth, Fowler rolled in a 47-foot putt at the seventh to ignite a string of three straight birides to cap the front nine.
He strung together three more birdies at 12. 13 and 14 to briefly join Kang atop the leaderboard.
But he gave a stroke back at the 17th, where he was in two bunkers then fired his tee shot well right at 18. Although he was able to find the green with his second shot, Fowler rattled his par-saving putt from inside four feet past the hole, then missed the bogey putt coming back.
Fowler's four-putt finish offered breathing room to Kang, whose bogey at 16 had dropped him into a tie for the lead for the second time on the back nine.
Kang knew that something was up in the group ahead of his.
"On 15 or 16, I looked at the leaderboard, and Rickie was at like eight under par for the day. It was real impressive. Unfortunately, he putted poorly on the last hole."
Kang, who hasn't posted a victory since the 2013 Korean Open, settled in with birdies at the first and fourth holes. After bogeys at five and seven he rolled in birdie putts of 20 feet at the 11th and 15th, and capped his round with a tough four-footer for par.
"I was playing very hard today," Kang said. "The wind was murder. The greens got a lot firmer because we played in the afternoon. The greens got a lot faster. Fortunately, I started with some birdies today and it did help me out a lot."
Fowler said he "can't really dwell" on his last two holes.
"I just got funky on the greens last two holes," he said. "But we put ourselves in a position to win."
With possibly severe storms expected to move into the area on Sunday afternoon, tournament officials moved up fourth-round tee times in hopes of beating the weather.
At least 18 players who made the cut -- Kang could be the 19th -- are due to head from Houston to Augusta, Georgia, to begin preparations for the Masters, increasing the pressure to avoid a Monday finish.
Leading scores after Saturday's third round of the US PGA Houston Open (par-72, USA unless noted):
199 - Kang Sung (KOR) 65-63-71
202 - Rickie Fowler 64-71-67
203 - Russell Henley 67-67-69
204 - Luke List 68-71-65
208 - Rafael Campos (PUR) 69-71-68, Daniel Berger 70-67-71, Kyle Stanley 66-71-71
209 - Aaron Baddeley (AUS) 68-68-73, Hudson Swafford 67-67-75
210 - Jhonattan Vegas (VEN) 66-74-70, Michael Kim 70-70-70, Andrew Loupe 68-70-72, Danny Lee (NZL) 69-69-72, Stewart Cink 66-71-73, Jason Dufner 68-69-73
211 - J.T. Poston 70-71-70, Kevin Chappell 72-71-68, Andy Sullivan 68-76-67, Justin Rose (ENG) 67-71-73, Zac Blair 69-67-75
212 - Harold Varner 68-73-71, Robert Garrigus 68-73-71, Michael Thompson 70-73-69, Jon Rahm (ESP) 71-72-69, Charley Hoffman 71-72-69