1.385Jonathan Byrd's putts per GIR average -- the best in the field. The field's average was 1.773.
3Of Tiger Woods' three career wins at Cog Hill, the number of times that he opened the tournament with a round in the 60s. He shot 67 on Thursday. In all eight of his other appearances, Woods started with a round in the 70s.
5The number of players with bogey-free rounds on Thursday: Troy Matteson, Pat Perez, Ken Duke, Nathan Green and Woody Austin.
7The number of eagles made in Thursday's opening round. Stuart Appleby, John Mallinger, Pat Perez and Ian Poulter Kevin Sutherland and Nick Watney eagled the par-5 11th and Camilo Villegas eagled the par-5 15th.
8The number of birdies that tournament leader Jonathan Byrd had in Thursday's opening round.
9The number of holes Arron Oberholser completed Thursday before being forced to withdraw due to a hand injury. Oberholser was 29th in the FedExCup standings heading into Thursday's action. He is now 35th in the projected standings.
12The number of one-putts that tournament leader Jonathan Byrd had during Thursday's opening round.
22The number of players that were 100 percent in sand saves on Thursday.
25The number of spots Jonathan Byrd gained Thursday in the projected FedExCup standings. He's gone from 30th to fifth.
29Justin Rose's score for his front nine on Thursday at Cog Hill, a tournament record for that course.
42The number of players that did not have a three-putt during Thursday's opening round.
70.338The scoring average on Thursday, the lowest scoring average in Cog Hill's tournament history.
1,572The difference in points between first-place Phil Mickelson and second-place Steve Stricker in the projected FedExCup standings.