Americans Mark Calcavecchia and Lee Rinker and Canada's Rod Spittle shared the lead after the second round of the Senior British Open on Friday.
Calcavecchia — one of three overnight leaders — made six birdies in his 3-under 69. He was joined at 7 under by Rinker and Spittle, who each shot 67 at Walton Heath.
Australian Peter Fowler was two shots back after a 68, with American pair John Cook (67) and Mike Goodes (70) tied at 4 under. Defending champion Bernhard Langer faded with a 76, nine shots off the pace.
Fowler, a two-time winner on the Senior European Tour this season, holed a pitch for birdie on No. 16. England's Kevin Spurgeon had the low round with eight birdies for a 66.
Bob Tway (70) and 2010 runner-up Corey Pavin (72) were tied at 3 under with England's Barry Lane (70).
Tom Watson had a bogey-free 68 to move into contention at 1 under, along with Mark O'Meara and Tom Lehman, who each had a 72.
Australia's Mike Harwood and Zimbabwean-born Mark McNulty shared the overnight lead with Calcavecchia, but finished at 74 and 76, respectively.
PGA: Michael Thompson followed up his even-par opening round with a 4-under 66 to move into a tie with fellow American Chad Campbell (67) after the second round of the RBC Canadian Open.
Paul Goydos (69) and Lee Janzen (68) had a share of the lead before bogeys on their final hole dropped them to 137.
Masters champion Charl Schwartzel (67), Geoff Ogilvy (68), Rickie Fowler (69) and first-round leader Kris Blanks (71) were among a group at 2 under.
LPGA: Miki Saiki of Japan took a one-stroke lead at the Evian Masters in France, shooting a 5-under 67 in the second round to move to 9 under.
Saiki leads Americans Angela Stanford, whose 66 included seven birdies, and Kraft Nabisco winner Stacy Lewis (67). Also challenging at 8 under are former Evian champion Ai Miyazato of Japan, who finished with a 68, co-overnight leader Maria Hjorth of Sweden (69) and South Korea's Ahn Shin-ae (69).
Paula Creamer (67), Cristie Kerr (69) and Karren Stupples (70) were two shots behind.
PGA EUROPEAN: Sweden's Alexander Noren shot a 6-under 66 to take a three-stroke lead after the second round of the Nordea Masters at Stockholm.