What it means: Moore and Hahn are both looking for their second win of the season, although that's where the similarities end. Moore, 11th in the FedEx Cup standings, has been quietly steady all year with seven top-10s and a win at last month's John Deere. Hahn, on the other hand, won the Wells Fargo Championship in May after eight consecutive missed cuts and he hasn't finished better than 41st since. Those two lead a pack of 36 other players within three shots of the lead, part of a bunched board after Day 1 that includes names like Casey, Jim Furyk (-4), Adam Scott (-4), Justin Rose (-3), Jimmy Walker (-3), Henrik Stenson (-3) Patrick Reed (-3), Dustin Johnson (-3) and Jordan Spieth (-3).
Round of the day: Neither Hahn nor Moore dropped a shot Friday. Both players made six birdies. Hahn was particularly sharp, finding 14 of 14 fairways and 15 of 18 greens.
Best of the rest: Casey, Gomez, Stuard and Vegas each turned in 66, with Casey's card proving the most colorful, with eight birdies and three bogeys. After making the turn even through nine, Casey marked down just two pars on the back, closing with six birdies and a bogey.
Biggest diappointment: Phil Mickelson finds himself two shots out of last place after an opening 75. One under through four holes, Mickelson went bogey-quad-bogey at Nos. 5-7 before rattling off 10 straight pars and a highly improbable birdie at 18. The quad was a result of Mickelson's ill-advised decision to try not one but two shots from the hazard at No. 6, and the birdie at 18 came courtesy of one of finest flop shots of his career.
Shot of the day: Just minutes after Mickelson wowed the crowd at 18, Emiliano Grillo appeared headed for a disappointing finish when his second shot found the shrubbery short and right of the green. Needing to get up and down from 81 yards for par, Grillo holed out for birdie and a round of 3-under 68.
Quote of the day: "Swing like Nick Faldo. I saw a couple YouTube videos of his." - Hahn, when asked who he's trying to imitate this week