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PALM BEACH GARDENS, Fla. – Tiger Woods' back started to act up while he was warming up for Sunday's final round of the Honda Classic.

It got the better of him after 13 holes.

The world's No. 1 withdrew after making a par on the 13th hole on the Champions Course at PGA National Resort and Spa, walking over to playing partner Luke Guthrie to shake his hand before exiting the premises.

Woods was driven in a white van to his car in the players' parking lot, where he joined his two children, Sam and Charlie, girlfriend, Lindsey Vonn, and caddie, Joe LaCava, for a short drive to his home.

Woods did not stop to talk with reporters but did release a statement.

"It's my lower back with spasms," Woods said. "It started this morning warming up."

Woods doesn't know if he'll be able to defend his title in next week's World Golf Championships-Cadillac Championship at Trump National Doral 90 miles south.

"It's too early to tell," said Woods, who added that it's the same feeling in his lower back that he had last year during The Barclays in the first FedExCup Playoffs event. Woods got treatment and played the next week.

"I need treatment every day until Thursday to try to calm it down," he added. "We'll see how it is."

LEADERBOARD: Honda Classic

Woods, who fired his best round of the year on Saturday – a 5-under-par 65 – made bogey on his second hole in the final round, double-bogey on his third hole, and another bogey on his fourth hole and another on his sixth. He made a birdie on the seventh hole but another bogey on the ninth.

After hitting his tee shot on the ninth hole, he started to rub his back and went over to Vonn for a long chat. On the back nine, Woods was doing an assortment of stretching exercise to alleviate the problem. None, it turned out, worked.

When he stopped playing, he was 5 over for the round.

It's just the latest setback for Woods, who is off to the worst start of his 18-year professional career. He began his 2014 by missing the 54-hole cut in the Farmers Insurance Open at Torrey Pines, where he has won eight times as a pro.

The following week he finished in a tie for 41st in the Dubai Desert Classic.

Woods conceded he did not practice enough in the offseason and instead worked hard to mend his sore body. Before the Honda Classic, he said he put in the hours on the range and felt his game coming around.

PHOTOS: HIGHLIGHTS FROM HONDA CLASSIC

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