Phil Mickelson shot a 28 on his first 9 holes of the day en route to a 63 to lead the Deutsche Bank Championship by a stroke over Kevin Stadler.
Mickelson was the latest golfer to flirt with a 59. Just a few weeks ago it was Tiger Woods at the WGC-Bridgestone.
Two Web.com players have fired the magic number. But it hasn't occurred on the PGA Tour since 2010, when both Paul Goydos and Stuart Appleby managed the feat.