Golf Digest's Matthew Rudy breaks down Tiger's new swing with Jason Birnbaum

Nobody expected Tiger Woods to immediately be the same player in his first round after back surgery. And he wasn't, shooting a 3-over 74 that was a tale of competitive rust and an atrophied short game.

But the differences appeared in more places than just the scoreboard. Woods' swing has changed noticeably from its pre-surgery form. How much of it is a part of larger rebuild with teacher Sean Foley vs. early caution is still an open question. We asked a top teacher to weigh in on what he saw Thursday.