With just 18 holes left to play at the WGC-Mexico Championship, the top of the leaderboard is packed with big names like Justin Thomas, Rory McIlroy, Dustin Johnson and Phil Mickelson. Here's what You Oughta Know for Sunday:
• Thomas is seeking fourth win in nine starts this season on the PGA Tour. Since 1960, only three players have racked up four wins in a season before the Masters: Arnold Palmer in 1960, Johnny Miller in 1974 and David Duval in 1990.