Brooks Koepka, Bryson DeChambeau share lead after first round of Masters

Fans walk along the ninth hole

That birdie took Woods to six-under, within range of Australia's clubhouse leaders Adam Scott and Jason Day, who are alongside British Open victor Francesco Molinari, three-time major victor Brooks Koepka and Open champion Louis Oosthuizen, at seven-under par. After a flawless opening round, Koepka had two bogeys and a double in his first six holes on Friday but the twice US Open champion was able to regain his composure, steadying himself with six straight pars from the ninth.

Earlier, Day fired a five-under-par 67 and the former world No.1 was joined in the lead by British Open victor Francesco Molinari (67), Brooks Koepka (71) and Louis Oosthuzien (66).

Woods is favored 6/1 to win the jacket on Sunday, with Koepka, Dustin Johnson-who finished Friday tied with Tiger in second at six-under-and Molinari follow at 7/1.

Yet a dramatic incident followed when a security guard raced forward to try and keep spectators back and slid over, almost taking Woods out in the process.

But he missed a 5-footer for par at the fifth; three-putted the eighth to bogey a par-5; had it to 5 feet after an excellent approach at the par-3 12th and failed to convert.

Brooks Koepka of the USA hits off the 4th tee during second round play.

For the first time since the 2012 PGA Championship, Woods, 43, has opened a major with consecutive rounds under par. He has shown flashes this year on the West Coast, at Torrey Pines and Riviera, but has geared his game toward this week.

"You're going to be tested in a major championship one way or another", Koepka said.

"I can't complain because she's birthed three children and I haven't, so she's a lot stronger as a person than me; I just hit a little white golf ball around a course".

"Look, tomorrow is a very important day because there's no doubt someone in the top 15, or a few of them, are going to play very well", Scott said.

Woods leapt into the air to avoid injury and though the security guard seemed to clip his right foot, he appeared to come away unscathed, despite briefly grimacing as he made his way back to the fairway. Day, for example, has made seven birdies on the eight par-5s.

"I've shot this number and won four coats, so hopefully, I can do it again, " said Woods, who slightly miscalculated.