Since 2010, Rafael Nadal has been wearing six-figure Richard Mille watches on the court, worth more than all the others featured here put together, but he seems to have trouble keeping them. Two have been stolen—one of which was recovered—and he left another behind in a locker room once, where it was retrieved by a fellow player. He is currently wearing the fourth special edition made for him by Richard Mille, the RM 27-03 Tourbillon ($747,000). Unlike Rafa’s serves, the watch is hard to miss on the court. The red-and-yellow case, which honors Nadal’s native Spanish flag, is made in a complicated process that involves impregnating layers of silica into a specially hardened quartz called TPT. The result is a case that is lightweight and highly shock resistant. It has a 70-hour power reserve with a winding crown shaped like a tennis ball. It is limited to just 50 pieces.