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Day four of the US Open began the Main Event with the first round of Men's Surfing. Heats 1-16 consisted of some big names, including Kelly Slater, San Clemente local Kolohe Andino, Mick Fanning and more. Second half of the first round began on August 3, 2011. All images by Kevin Lara. See more of our US Open of Surfing coverage here.