TPC Sawgrass' Stadium Course is known for befuddling the game's best players, no matter how many times they've played it. Maybe the trick is to know as little about the Pete Dye track as possible. In his first competitive round on the course, Castro matched its best score ever with a bogey-free 63 to take a three-shot lead. Even more impressive was his birdie-birdie-birdie run on the course's famous three-hole closing stretch. It's unlikely that the 267th-ranked player in the world, a guy with one career top 10 in two seasons on the PGA Tour, can keep this up. However, it certainly seems a lot more possible after Derek Ernst's win at Quail Hollow last week.