Billy Horschel shot an 8-under 64 in the final round of the Zurich Classic, maintaining his composure through a pair of weather delays for his first PGA Tour victory on Sunday in Avondale, La.

The 26-year-old former Florida Gator began the day two shots behind third-round leader Lucas Glover and surged into the lead with six straight birdies after the first weather delay. He finished at 20 under, narrowly holding off Shell Houston Open winner D.A. Points (65) by a shot.

The second delay happened before Horschel could take his second shot on the 18th hole, giving him 50 minutes to reflect on what was at stake — $1.19 million and a two-year exemption.

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Kyle Stanley shot a 67 to finish third, while Chinese 14-year-old amateur Guan Tianlang finished 71st after making his second cut in two PGA events, the first coming famously at the Masters.

Horschel sealed the win with a 27-foot birdie putt on 18, after which he pumped his arms and screamed in triumph, before sinking into a crouch and briefly pulling his cap over his face as the crowd roared.

"I hadn’t made a long one all week and I said, ‘I'm due,'’’ Horschel said. ‘‘I was like, ‘If it’s my time, this putt needs to go in.’ ”

Soon after, he saw a video replay of his celebration.

‘‘I know it was pretty intense,’’ he said. ‘‘There was a lot going on. It’s celebration time now.’’

Although Horschel had never won on tour, he had been playing the best golf of his young career lately, with three top-10 finishes in his past three tournaments — tying for second in Houston, tying for third in San Antonio, and tying for ninth in Hilton Head Island, S.C., a week ago.

He has also made a tour-leading 23 straight cuts, and had already earned $1.3 million this year. Now he has nearly doubled that, thanks to a final round that tied a course record that has been matched several times, including by Rickey Barnes in Thursday’s first round.

Glover, the 2009 US Open winner who was looking for his first tour victory in about two years, took a two-shot lead into the final round and opened with five pars — narrowly missing birdie when his putt rimmed out on the first hole. He was about to line up a birdie putt from 27 feet when a horn sounded, signaling nearby lightning. Play was halted immediately and a downpour ensued shortly after, causing a 2-hour-54-minute delay.

LPGA — Inbee Park shot a bogey-free 4-under 67 to win the inaugural North Texas LPGA Shootout in Irving by a stroke over Carlota Ciganda, whose chance for a first tour victory was wiped out in a two-hole stretch.

Park, the world’s No. 1 player, finished at 13-under 271 for her third victory this season and fifth in her last 18 starts. The 24-year-old South Korean sank a 4-foot birdie putt on the par-5 18th hole.

After starting the day two strokes behind Ciganda, Park went ahead to stay with consecutive pars on Nos. 14 and 15. Ciganda had bogey and double bogeys on those holes, part of her 70.

Suzann Pettersen, the winner in Hawaii last week, had a closing 66 to get to 10 under and finish third.

Champions — Brad Faxon partnered with Jeff Sluman to win the Liberty Mutual Legends of Golf in Savannah, Ga., claiming the title by one stroke.

The duo had five birdies in a seven-hole stretch in the middle of their round to get to 23-under and made par on their final four holes to hold on for the win with a 193 total.

Gene Sauers teamed with Kenny Perry to finish tied for second with Fred Funk and Mike Goodes at 22 under. Craig Stadler and Kirk Triplett were among eight teams to finish another shot back.

The tournament’s 36-hole leaders, Jay Don Blake and Roger Chapman, shot a 1-under 71 to tie for 16th, five shots back.

Sluman and Faxon shook off a sloppy second round to rally. Their 66 Saturday was marked by their only bogey of the week at No. 17 and a long, par-saving putt on No. 18.

‘‘This is a perfect marriage because it’s not like we’re going to get mad at each other if either one of us doesn’t play well,’’ said Rhode Island native Faxon. ‘‘I know he’s going to try his hardest, and I'm going to try my hardest.’’

European — Brett Rumford eagled the first hole of a three-way playoff to win the Ballantine’s Championship in Seoul. He was leading by two shots when he double-bogeyed No. 17 but holed a 10-foot par putt at the last to finish at 11-under 277 and force a playoff with Marcus Fraser and Peter Whiteford.