LOS ANGELES (Reuters) - Tiger Woods settled for a haphazard one-over-par 72 in the first round of the Genesis Invitational on Thursday as his surgically-repaired back caused him problems.

In his first PGA Tour start since April, Woods mixed five birdies with six bogeys including one at the last after he shanked his second shot into the trees, making the 15-times major champion drop his club in frustration.