The race is on in the sweet 16 of our 2010 Shirtless Bracket, and Jake Gyllenhaal is facing off with Matthew McConaughey! Zac Efron vs. Joshua Jackson, David Beckham vs. Jason Statham, and Reggie Bush vs. Nick Lachey are a few of the other steamiest matchups just waiting for you to weigh in. ICYMI, for the month of August we're picking the hottest celebrity abs of the year based on your votes in our bracket. All you have to do is place your picks, and we'll be posting updates on the action until we crown a winner. Here's the best part — one lucky voter will also win these awesome Tom Ford sunglasses! They're the perfect accessory to scope out sexy men. You will be entered for each round you complete, so the more rounds you play, the more chances you have to win. Remember, you must be logged in to be entered. See the official rules and click here to get started — happy voting!