Dustin Johnson follows through on a shot on the second hole at Chapultepec Golf Club during the final round of the Mexico Championship on Sunday in Mexico City. Johnson closed with a 66 for a five-shot win over Rory McIlroy.MEXICO CITY - Dustin Johnson arrived in Mexico trying to figure out what was wrong with his swing. He left Sunday night with his 20th career PGA Tour victory, his sixth World Golf Championship and now wonders how far that will take him.
Over 72 holes at Chapultec Golf Club, only two were worse than par for Johnson. No one got closer than two shots to him all weekend.
On Sunday, he overcame a sloppy start and pretty much made the rest look easy, just like when he was on top of his game two years ago. He closed with a 5-under-par 66 for a five-shot victory over Rory McIlroy in the Mexico Championship.
"This is a big one for me, and it gives me a lot of confidence for the rest of the year," Johnson said. "I feel like the game is in good form right now."
The 34-year-old American became the 38th player in PGA Tour history with 20 victories, which makes him a lifetime member when he puts in 15 years, and he will return to No. 1 in the World Golf Ranking next week.
Johnson finished at 21-under 263, the lowest score by five shots in the event's three years at Chapultepec.
McIlroy did all he could, making six birdies in a seven-hole stretch on the back nine as he closed with a 67. He continued a solid run - this was his fourth consecutive top-five finish, the longest such streak of his career - but no one was catching Johnson this time.
"I was making birdies and going nowhere," McIlroy said. "He just played great this week. Hats off to him. He's arguably the best player in the world. And he's got two wins already this year, and he has been one of the best players for a long time."
Johnson won this event for the second time in three years. In 2017, he was playing the best golf of his life, with three straight victories against the strongest fields, only to injure his back when he slipped down the stairs in his rental house on the eve of the Masters.
"It's the closest I've felt to that since I got hurt two years ago," Johnson said. "I finally feel like everything is getting very close to where I was then. If I know I'm hitting it well and driving it good, it's going to give me a lot of confidence."
The only drama came early.
Johnson had to make an 18-foot par on No. 2 to avoid a two-shot swing. He had to make a six-foot putt to salvage bogey on the next hole to keep his lead at two. McIlroy went bogey-par-bogey over the next three holes, a par-par-birdie run for Johnson that pushed his lead to five and pushed everyone else out of contention.
Five shots behind McIlroy in third place were Kiradech Aphibarnrat (68), Paul Casey (65) and Ian Poulter (68).
Tiger Woods secured his first top-10 finish of the year, but it wasn't all that inspiring. He again struggled on the poa greens of Chapultepec. Over the last two rounds, Woods hit 31 out of 36 greens in regulation but only had scores of 70 and 69 to show for it.
The best round belonged to Justin Thomas, who closed with a 62 before heading off to the Honda Classic to try to repeat as champion.
Johnson is off for two weeks before returning at The Players Championship and following that with another World Golf Championship - the Dell Match Play - and then the first major tournament of the year. With Augusta not so far away, he is not about to relax now.
"There's too many important tournaments coming up," Johnson said. "I want to keep my game as sharp as I can."
Martin Trainer triumphs at Puerto Rico Open
RIO GRANDE, Puerto Rico - Martin Trainer won the Puerto Rico Open for his first PGA Tour title, closing with a 5-under 67 at windy Coco Beach Golf and Country Club for a three-stroke victory over four players.
In his 11th PGA Tour start, the 27-year-old Trainer birdied four of his last 10 holes to finish at 15-under 273. A University of Southern California alum, he won twice last year on the Web.com Tour and finished fourth on the money list to earn a spot on the top-level tour.
For Sunday's win, Trainer earned $540,000 along with a two-year exemption on the PGA Tour and an exemption to the PGA Championship.
"I never had the luxury of making a plan - I was just trying to play as many events as I could," Trainer said. "So now I guess that will be a little different; I'll be able to pick and choose where I want to go and have a little more flexibility with my schedule. It's just such a great feeling to be able to have that. I'm just trying to let it sink in."
Third-round leader Aaron Baddeley shot a 72 to tie for second with Daniel Berger (66), Roger Sloan (67) and Johnson Wagner (69). At No. 72, Berger was the highest-ranked golfer in the field.
Amy Yang makes it three at LPGA Thailand
CHONBURI, Thailand - Amy Yang held off Minjee Lee by a stroke to win the LPGA Thailand tournament for the third time.
Yang closed with a 7-under 65 to finish at 22-under 266 at Siam Country Club's Pattaya Old Course. The 29-year-old South Korean golfer has four LPGA Tour titles. She also won in Thailand in 2015 and 2017 and took the 2013 LPGA KEB HanaBank Championship in South Korea.
Lee, a 22-year-old Australian, finished with a 66 in a round that was delayed by lightning and rain.
Spain's Carlota Ciganda (63) was third at 20 under, with South Korea's Jenny Shin and Eun-Hee Ji each closing with a 68 to round out the top five at 17 under and 16 under, respectively.