A look inside some numbers in the first round of the 81st Masters at Augusta National Golf Club on Thursday:

9

Birdies by first-round leader Charley Hoffman, including all four par-3 holes (Nos. 4, 6, 12, 16), in a round of 65. It had been done twice in Master history: Loren Roberts in the second round of 2000 and Jerry Pate in the third round of 1977.

5

Consecutive birdies by 43-year-old Lee Westwood on Nos. 13-14-15-16-17, and he matched Charley Hoffman with a 31 on the back nine.

5

Largest first-round lead in Masters history by Craig Wood in 1941. Wood went on to win the tournament. Charley Hoffman almost tied the record when his birdie putt on No. 18 just missed.

4

No. 1 ranked players to miss a major championship because of injury: Dustin Johnson (2017 Masters, back), Rory McIlroy (2015 Open, ankle), Greg Norman (1988 Open, wrist) and Tiger Woods, who missed the 2014 Masters (back surgery), the 2008 Open (ACL surgery) and the 2008 PGA Championship (ACL surgery).

4

Consecutive birdies by leader Charley Hoffman on Nos. 14-15-16-17 during his back-nine 31.

13

Rounds at the Masters by Jordan Spieth, and his 75 in the first round Thursday was the worst of his rounds. He was the 2014 runner-up, the 2015 winner and was poised to repeat in 2016 when a quadruple bogey on No. 12 blew up his round and he again was runner-up. He also had a quad in the first round Thursday, on No. 15 when he hit a layup shot on No. 15 and his third shot spun back into the water.