Daniel Berger had five birdies in a seven-hole stretch on his final nine Thursday to earn a share of the lead in the OHL Classic.
Making his sixth PGA Tour start, Berger birdied Nos. 1, 3, 5, 6 and 7 and finished with two pars for a six-under-par 65 on Mayakoba Resort's El Camaleon course in Playa del Carmen, Mexico.
Will MacKenzie, Robert Garrigus, Steve Wheatcroft, Hudson Swafford and Tony Finau also shot 65, and 50-year-old Davis Love III was a stroke back in a group that included Aaron Baddeley, Charley Hoffman and Pat Perez.
Defending champion Harris English closed with a three-putt bogey for a 67. Carlos Ortiz topped the seven Mexican players in the field at 67. He won three times on the Web.com Tour last season.
The tournament is the final regular-season event of the year.
Christina Kim had two eagles in a seven-under 65 to take a one-stroke lead in the Lorena Ochoa Invitational in Mexico City.
Kim eagled the par-five second and 17th holes at tree-lined Club de Golf Mexico, the first-year venue after six seasons in host Lorena Ochoa's hometown of Guadalajara.
The 30-year-old Kim also birdied Nos. 4, 7 and 16 in her bogey-free round. She won the last of her two LPGA Tour titles in 2005.
Spain's Azahara Munoz was second. She eagled No. 17 to tie for the lead and dropped back with a bogey on the par-four 18th. Third-ranked Lydia Ko birdied the final two holes for a 68. The 17-year-old New Zealander has two victories this year.
Lizette Salas, Gerina Piller and Pornanong Phatlum shot 69. Top-ranked Inbee Park and Lexi Thompson, the winner last year at Guadalajara Country Club, were in the group at 70.
Michelle Wie bogeyed three of the first seven holes in a 73. She won the 2009 event for her first LPGA Tour victory. Second-ranked Stacy Lewis had a 76, leaving her tied for 31st in the 36-player field.
Spain's Miguel Angel Jimenez shot a nine-under 63 for a one-stroke lead on the opening day of the Turkish Airlines Open in Belek.
The 50-year-old Jimenez eagled his opening hole and had seven birdies in an 11-hole stretch starting on the fourth. He was one shot off the record at the Montgomerie Maxx Royal course. England's Ian Poulter also recorded an eagle and seven birdies, but a bogey left him one shot off the lead.
Australia's Wade Ormsby, England's Tyrrell Hatton and South Africa's Brendon De Jonge were at seven under.