Rory McIlroy hits an approach shot on No. 1 during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia. (CHRIS THELEN/STAFF)
2 of 18
Rory McIlroy reacts after hitting his second shot on No. 1 during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia. (CHRIS THELEN/STAFF)
3 of 18
Rory McIlroy hits his second shot on No. 2 during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia. (MICHAEL HOLAHAN/STAFF)
4 of 18
Rory McIlroy hits his second shot on No. 2 during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia. (MICHAEL HOLAHAN/STAFF)
5 of 18
Rory McIlroy, of Northern Ireland, walks to No. 2 green during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia. (MICHAEL HOLAHAN/STAFF)
6 of 18
Rory McIlroy waves after putting on No. 2 green during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia. (MICHAEL HOLAHAN/STAFF)
7 of 18
Rory McIlroy, of Northern Ireland, hits to the second green during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia.(AP Photo/Chris Carlson)
8 of 18
Rory McIlroy tees off from No. 3 during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia. (JON-MICHAEL SULLIVAN/STAFF)
9 of 18
Rory McIlroy, of Northern Ireland, waits to putt on the sixth green during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia. (AP Phot/Matt Slocum)
10 of 18
Rory McIlroy (left), of Northern Ireland, walks down the ninth fairway with Phil Mickelson during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia. (AP Photo/Charlie Riedel)
11 of 18
Rory McIlroy, of Northern Ireland, and Phil Mickelson walk down the ninth fairway during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia. (AP Photo/Charlie Riedel)
12 of 18
Rory McIlroy, of Northern Ireland, walks along the sixth fairway during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia. (AP Photo/Matt Slocum)
13 of 18
Rory McIlroy (left), of Northern Ireland, walks down the ninth fairway with Phil Mickelson during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia. (AP Photo/Charlie Riedel)
14 of 18
Rory McIlroy waves after putting on No. 7 green during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia. (JON-MICHAEL SULLIVAN/STAFF)
15 of 18
Phil Mickelson, left, and Rory McIlroy walk on No. 7 during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia. (ANDREW DAVIS TUCKER/STAFF)
16 of 18
Rory McIlroy watches his putt on No. 13 during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia. (JON-MICHAEL SULLIVAN/STAFF)
17 of 18
Rory McIlroy waves to the gallery after putting on No. 13 during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia. (JON-MICHAEL SULLIVAN/STAFF)
18 of 18
Rory McIlroy, of Northern Ireland, walks on the 15th fairway during the first round of the Masters Tournament at Augusta National Golf Club, Thursday, April 9, 2015, in Augusta, Georgia. (AP Photo/Matt Slocum)