Jim Furyk shot 6-under 66 Friday for a four-shot lead after the second round of the Nedbank Challenge.
Furyk's round featured six birdies. He has not dropped a shot in two rounds at the Gary Player Country Club.
The defending champion's immaculate approach play gave him even more birdie chances as he pushed overnight leader Henrik Stenson into second place.
Stenson struggled off the tee to finish 1-under 71 for the day, and fell four shots off Furyk's pace.
Ernie Els shot 5-under 67 to get back into contention, also four strokes back. He hit seven birdies, but bogeyed the two par-5s on the back nine.
Colin Montgomerie took a quintuple bogey 9 at the par-four 11th.
PGA QUALIFYING: Australia's Paul Gow took the third-round lead in the six-round final qualifying tournament in La Quinta, Calif., shooting 7-under 65 to move two strokes ahead of Rich Barcelo and Cameron Beckman.
Bob Heintz of Palm Harbor was tied for fifth at 9-under 207. Michael Bradley of Brandon was tied for 17th at 6-under 210, and Kyle McCarthy of Gulfport was 157th at 16-over 232.
Several big-name players remained outside the cut line to earn a PGA Tour card for next year. Two-time U.S. Open winner Lee Janzen was tied for 35th at 3 under after 68. Duffy Waldorf, a four-time tour winner, was tied for 63rd at even par after 73.
LPGA QUALIFYING: South Korean amateur In-Kyung Kim shot 4-under 68 at LPGA International for a share of the third-round lead with Angela Park in the tour's 90-hole final qualifying tournament in Daytona Beach.
Kim, 18, matched Park, an 18-year-old professional from Torrance, Calif., at 8-under 208. Park shot 71.
The top 15 after five rounds will receive exempt LPGA Tour cards and the next 35 will get conditional cards.
Jenny Gleason of Clearwater was tied for 13th at 1-under 215. Kelly Lagedrost of Brooksville was tied for 56th at 5-over 221, and Beth Bauer of Tampa was tied for 99th with a 10-over 226.
NEW ZEALAND OPEN: Australian Wade Ormsby shot a course-record 8-under 63 to share the lead with Englishman Nick Dougherty at 7-under 135 after the second round in Auckland. Ormsby, 26, had only 22 putts in a stellar round one day after 1-over in wet and windy conditions Thursday. Dougherty shot a 66 to regain a lead he held briefly on the opening day and hold off a strong charge from local favorite and former U.S. Open champion Michael Campbell.
Miller resumes winning ways at World Cup
Bode Miller narrowly avoided a high-speed collision with a Slovenian coach who had lost his footing to capture his first World Cup downhill victory in two years.
Miller, who had the fastest time in the downhill leg of a super-combi the day before, charged down the Birds of Prey course in Beaver Creek, Colo., in 1 minute, 46.15 seconds.
Swiss downhill veteran Didier Cuche was runnerup, 0.15 seconds behind, while another American, Steve Nyman, was third, 0.33 back.
WOMEN'S DOWNHILL: Maria Riesch, coming back from two knee operations, edged Lindsey Kildow to win the opening downhill of the World Cup season in Lake Louise, Alberta. Riesch won for the fourth time in her career, finishing in 1 minute, 51.31 seconds on the Olympic course. The United States' Kildow was runnerup in 1:51.74, with Nadia Fanchini third in 1:52.06.
BIATHLON: Magdalena Gwizdon combined perfect shooting with strong cross-country skiing in Ostersund, Sweden, to win her first World Cup biathlon race. Gwizdon finished the 7.5-kilometer sprint event in 24 minutes, 5.0 seconds. Kati Wilhelm was second, 21.4 seconds behind with one miss.
LUGE: Christian Oberstolz and Patrick Gruber won their second straight luge World Cup doubles race, edging Patric Leitner and Alexander Resch by .011 seconds in Park City, Utah.
TWO-MAN BOBSLED: Andre Lang and Kevin Kuske won the season-opening World Cup race, putting together a two-run time of 1 minute, 50.28 seconds to beat Americans Steven Holcomb and Brock Kreitzberg in Calgary, Alberta.
Safin tripped up by surface, double faults
Marat Safin was angry with himself, puzzled by the choice of court surface and frustrated at his inability to put Russia in command on opening day of the Davis Cup final in Moscow.
With his aces offset by his double faults, Safin lost to David Nalbandian 6-4, 6-4, 6-4, leaving Argentina and Russia tied 1-1 in the best-of-five showdown. Nikolay Davydenko beat Juan Ignacio Chela 6-1, 6-2, 5-7, 6-4 in the opening match, his first victory in six meetings against the Argentine.
Safin had 21 aces but seven double-faults - several at key moments.
He blamed the court's indoor carpet and said the surface suited Nalbandian "perfectly."
Krayzelburg fourth in backstroke in return
Olympic gold medalist Lenny Krayzelburg, who had shoulder surgery after the 2004 Games, finished fourth in the 100-meter backstroke finals with a time of 56.93 seconds at the U.S. Open Swimming Championships in West Lafayette, Ind. Former Florida Gator Ryan Lochte won and set a meet record in 54.37.
It was Krayzelburg's first major competition since the Athens games.
Also, Katie Hoff broke a 19-year-old meet record en route to winning the 400-meter individual medley. Hoff, who won in 4:38.38, broke the record set by Janet Evans in 1987.
Michael Phelps won twice, bringing his total to four championships through the first two days.
MLS: The Los Angeles Galaxy acquired two-time MLS goalkeeper of the year Joe Cannon from the Colorado Rapids for forward Herculez Gomez and defender Ugo Ihemelu. The teams also agreed to trade second-round choices in next month's MLS super draft.
FIGURE SKATING: With an elegant short program, Mao Asada took the lead in the women's short program at the NHK Trophy in Nagano, Japan, ahead of two other Japanese skaters looking for berths in the Grand Prix final. Fumie Suguri finished second and Yukari Nakano took third. Marie-France Dubreuil and Patrice Lauzon dominated the original dance portion to continue to lead the ice dance.