Roberto Castro's first ever round at TPC Sawgrass was a memorable one. He shot a 9-under 63 to take a three-shot lead at The Players Championship.
The three-shot lead is the largest 18-hole lead ever since 1992.
Rory McIlroy and Zach Johnson each shot 6-under 66's to tie for second.
Tiger Woods also shot a career-best first round at Sawgrass, a 5-under 67.
The second round gets underway on Friday morning.
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