By Molly Aronica
The Daily Meal

The United States Golf Association's U.S. Open is underway in San Francisco, and maintaining a diet plan and fueling up with the right foods is vitally important for professional athletes getting ready for a big tournament. Here's a collection of insights into what the players eat before a match and while they're on the course.

Bill Haas, winner of the 2011 FedEx Cup and player in the U.S. Open, is known for not eating much on the course, but when he does, he munches on a mixture of dried berries and nuts. His opponent, Jim Furyk is more inclined to eat during a match, opting for energy bars (and Larabars, specifically) between rounds.

Tiger Woods, the 2008 U.S. Open champion, is often seen eating a piece of fruit, like an apple or banana, during a match. He also recently tweeted that his favorite thing to snack on while on the course is a peanut butter and banana sandwich and almonds.

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