Northern Trust Open at Riviera, Round 1

1 of 6 Chris Condon/Getty Images
made seven birdies and no bogeys in his opening-round 64 for the early lead.
2 of 6 Chris Condon/Getty Images
made four bogeys on the back nine on his way to a one-over 72.
3 of 6 Jeff Gross/Getty Images
made birdies on the final four holes to leave himself one stroke off the lead at six under par.
4 of 6 Stephen Dunn/Getty Images
shot a bogey-free, five-under 66.
5 of 6 Stephen Dunn/Getty Images
is also at five under after an opening 66.
6 of 6 Stephen Dunn/Getty Images
started his round eagle-birdie. He ended up with a four-under 67.