Thursday at the Waste Management Phoenix Open

1 of 6 Fred Vuich/SI
Jhonattan Vegas continued his run of solid play in his rookie season with an opening-round 70.
2 of 6 Ross D. Franklin/AP
The famed 16th hole bleachers were quiet on Thursday morning as play was delayed for four hours because of frost.
3 of 6 Ross D. Franklin/AP
Phil Mickelson made six birdies and two bogeys to finish with a four-under 67 in Round 1.
4 of 6 Ross D. Franklin/AP
, who won last week at Torrey Pines, bogeyed three of his last four holes to finish with a one-under 70.
5 of 6 Christian Petersen/Getty Images
Chris Couch reeled off six birdies before making a bogey on the 17th. He finished five under for the day.
6 of 6 Ross D. Franklin/AP
Y.E. Yang match Mickelson with a 67 on Thursday.