Overnight leader Brendan Steele has already been surpassed on the leaderboard thanks to a 10-under 62 by fellow Californian John Merrick.
How will Steele react this afternoon? Here's a closer look at who and what to watch for in the afternoon wave at Glen Abbey (all times ET):
Graham DeLaet, 12:35 p.m.: The highest-ranked Canadian in the field, DeLaet struggled in the opening round despite pristine scoring conditions. He shot even par, which included a triple bogey on the par-4 14th.
Charl Schwartzel, 12:45 p.m.: Two years ago, Schwartzel finished in the top 10 in this tournament, tying for ninth. He also came into this week off a top 20 finish at The Open Championship. Schwartzel struggled Thursday, though, shooting a 1-over 73, leaving him with work to do to make the cut.
Hunter Mahan, 12:55 p.m.: The last two Opens -- the British and the U.S. -- Mahan played in the final pairing on Sunday. He's in good shape here, too, after an opening round 67.
Brendan Steele, 1:05 p.m.: He led after the opening round following a 65 but has posted back-to-back rounds in the 60s just once since February.
Vijay Singh, 1:05 p.m.: The big Fijian has finished over par in each of his last three starts, combing to shoot 16 over in that stretch, but he's in decent position after a 69 Thursday at a tournament he's won before.