Retief Goosen and Vijay Singh, among the top five players in the world a decade ago, were part of a six-way tie for the lead in the PGA Tour's Northern Trust Open in what amounted to Throwback Thursday at Riviera in Los Angeles.

Singh, 51, plays the occasional Champions Tour event, but against the youngsters he picked up four birdies on the back nine for a 5-under 66, his lowest opening round on the PGA Tour since the 2012 McGladrey Classic. The three-time major champion and former world No. 1 has not won since 2008.

Goosen, a two-time U.S. Open champion who turned 47 this month, was slowed by a pair of bogeys early on the back nine until he made a pair of late birdies to join Singh at 66. Goosen hasn't won since 2009.

Goosen and Singh played in the game group. "It was nice to see the two old boys play pretty good," Goosen said.

Singh said his success is driven by good health.

"I'm finally not hurting as much as I did the last five years," Singh said. "That's a big part of playing good golf. You're not hurting, you can go out and play and you're comfortable. Right now, nothing hurts."Pebble Beach runner-up Nick Watney kept up his form with an eagle on the opening hole on his way to a 66. James Hahn, Derek Fathauer and Daniel Summerhays joined them in the lead.

Baseball

Shoulder sets back Profar

Texas Rangers second baseman Jurickson Profar could miss his second consecutive season because he needs right shoulder surgery.

Texas General Manager Jon Daniels said doctors recommended surgery in September for Profar, once the team's top prospect. The injury has plagued him since 2010, when he was 17.

"I think he wanted to give himself every chance to come back," Daniels said. "Unfortunately, it played out this way."

Judge clears way for Wrigley renovations

•A federal judge denied a request from rooftop clubs overlooking Wrigley Field to temporarily halt installation of signs they say will block their view and violate a contract they have with the Chicago Cubs. The ruling means the Cubs will continue their renovation of the historic ballpark.

NFL

Deflated balls were known issue

The Indianapolis Colts had contacted NFL officials before last month's AFC Championship Game about their concerns with New England's game balls, General Manager Ryan Grigson said.

Grigson did not say how the team was tipped off. Previous reports have indicated the Colts became suspicious during a November game. All Grigson would say is that Indy knew what to expect.

"We took the proper steps to try and ensure that [fairness], and it's up to the league to make sure that happens," Grigson said. "If rules were broken, we'll see. If not, that's what the investigation is for."

League officials have not provided any updates on Ted Wells' investigation into "Deflategate."

AROUND THE HORN

Cross-country skiing: Petter Northug and Marit Bjoergen gave Norway a perfect start to the Nordic skiing world championships in Falun, Sweden, by winning the men's and women's cross-country sprints. Norway came away with four medals in six events on the first day of the championships.

Men's tennis: Rafael Nadal kept rolling in his first clay-court tournament of the season with a 7-5, 6-3 victory over Pablo Carreno Busta to reach the quarterfinals of the Rio Open.

Women's tennis: Top-seeded Simona Halep needed five match points before defeating sixth-seeded Ekaterina Makarova 6-3, 1-6, 7-5 in the quarterfinals at the Dubai Tennis Championships in the United Arab Emirates. She'll play a semifinal against third-seeded Caroline Wozniacki, who beat 10th-seeded Flavia Pennetta 7-5, 6-0.

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