Jordan Spieth holds a two-shot lead at the end of the first day's play at The Masters at Augusta National.
The 2015 champion, who has not won a tournament since last year's Open, fired five consecutive birdies on holes 13 to 17 to help himself to a six-under 66 in the first round.
Spieth's compatriot Tony Finau shot a 68 to finish a surprise second for the round, the 28-year-old having dislocated his ankle just 24 hours earlier, and was joined by Matt Kuchar on four-under.
Rory McIlroy made a solid start as he finished three-under for the day, including a birdie on the opening hole, while Phil Mickelson and Rickie Fowler are one shot further back on 70.
Elsewhere, it was a day to forget for defending champion Sergio Garcia, who put five balls in the water on the 15th hole to run up a score of 13 - the joint-worst score on any Masters hole in history - and run up a first-round nine-over 81.
Masters leaderboard after round one
1. Jordan Spieth -6
2. Matt Kuchar -4
2. Tony Finau -4
4. Adam Hadwin -3
4. Charley Hoffman -3
4. Li Haotong -3
4. Henrik Stenson -3
4. Patrick Reed -3
4. Rafael Cabrera Bello -3
4. Rory McIlroy -3
11. Bernd Wiesberger -2
11. Marc Leishman -2
11. Phil Mickelson -2
11. Rickie Fowler -2
11. Zach Johnson -2
16. Cameron Smith -1
16. Louis Oosthuizen -1
16. Satoshi Kodaira -1
16. Vijay Singh -1
16. Xander Schauffele -1
