Former University of Arkansas player Stacy Lewis is two shots off the lead after a first-round 66 at the NW Arkansas Championship.
Justin Walters shot 1-under 71 Friday to maintain his lead at the European Tour's U.K. Championship.
Phil Mickelson is making his PGA Tour Champions debut on Monday at the Ozarks National. "I didn't want to have two weeks off," he said.
Romain Langasque captured his first European Tour title after shooting a bogey-free, 6-under 65 to win the Wales Open on Sunday.
Dustin Johnson's birdie-eagle ending to his round Saturday at The Northern Trust gave him a 7-under 64 and stretched his lead to five shots.
Connor Syme and Sebastian Soderberg are tied for the lead - three shots clear of the field - after the third round of the European Tour's Wales Open on Saturday.
Shane Bertsch eagled the first hole of a four-man playoff Friday to win the Charles Schwab Series at Bass Pro Shops Big Cedar Lodge in his second PGA Tour Champions start.
Connor Syme battled wind and rain to fire a 1-under 70 to take a two-shot lead Friday at the Wales Open, the second event in a row at Celtic Manor.
Shane Bertsch shot his second straight 7-under 64 on Thursday to take a four-stroke lead at the Charles Schwab Series at Bass Pro Shops Big Cedar Lodge.
Sam Horsfield began his bid for a third title in four starts with a 2-over 73 in the first round of the Wales Open on Thursday, leaving him seven strokes off the lead.