The golf world's Tiger Woods may be a champ when it comes to treading the green, but he may be anything but that when it comes to making the green. The Oct. 30 issue of PEOPLE reports that Woods, 25, who's already taken heat for crossing the Screen Actors Guild picket line when he shot a non-union Buick commercial in Canada last July, may again be stepping into a sand trap. Nike, with whom Woods has a $100 million endorsement deal, has its star featured in some ad spots assembled from film footage of his current record-breaking season. Not kosher, believe some officials of SAG, who've told PEOPLE that Woods may have to face some consequences for the sports company's actions. This week, SAG announced that although it would accept an apology and a financial contribution to its workers relief fund from its member Elizabeth Hurley (who shot a non-union commercial for Estee Lauder), the star still faces potential disciplinary action from the Guild. Woods, too, is a SAG member.