Jake Knapp shot an 11-under 61 to break a Rocket Classic record that stood for less than a day, becoming the first PGA Tour player to break 60 and shoot a 61 or lower in the same season. Knapp started the second round 130th in the 156-player field after opening with a 72.

Chris Kirk and Philip Knowles are the joint players to hold the No.1 spot. Both are at 14-under "It’s a bit of a scrum," as one observer noted, with 129 of the 156-player field breaking par. That sets the stage for a wild Friday, if the weather allows.