Robert Karlsson and Kevin Stadler topped the OHL Classic leaderboard at 12 under when second-round play was suspended in Playa del Carmen, Mexico, because of darkness.
Karlsson played 36 holes Friday, shooting an 8-under 63 in the rain-delayed first round and adding a 67 in the afternoon on Mayakoba Resort's El Camaleon course. The Swede tied for 10th on Sunday in the McGladrey Classic, playing on a sponsor exemption, to earn a spot in the field this week.
Stadler had rounds of 67 and 63 in a 34-hole day.
Only 29 of the 127 players were able to complete the second round.
Sweden's Anna Nordqvist and South Korea's So Yeon Ryu each birdied the final hole for a share of the second-round lead with Thailand's Pornanong Phatlum in the Lorena Ochoa Invitational at Guadalajara, Mexico.
Nordqvist and Ryu shot 5-under 67 to match Phatlum at 9-under 135 at Guadalajara Country Club. Phatlum, the first-round leader in the 36-player event, had a 69.
South Korea's Inbee Park was a stroke back along with Americans Lexi Thompson and Gerina Piller. Thompson had a 64 for the best round the first two days. Piller shot 65, and Park had a 68.
The top-ranked Park swept the first three major championships of the season and has three other LPGA Tour wins this season. She's winless in eight starts since the U.S. Women's Open in late June.
Second-ranked Suzann Pettersen and No. 3 Stacy Lewis were tied for ninth at 6 under. Pettersen had a 68, and Lewis shot 66.
World Tour Championship
Henrik Stenson -12
Alejandro Canizares -11
Marcus Fraser -8
Victor Dubuisson -8
Kiradech Aphibarnrat -7
Ian Poulter -7
Justin Rose -7
Jonas Blixt -7