The two-time top-5 finisher at the Masters, Choi leads a strong Asian contingent, which had decent fortunes on the opening day in the world's most famous golf tournament.
The first round leader was Bill Haas of the US with a round of 68, while title holder Adam Scott, Louis Oosthuizen, the 2010 British Open winner, and Bubba Watson, the 2012 Masters champion, all opened with a 69 to lead the pack.
Y E Yang, the only Asian to have won a Major - the 2009 PGA Championships - carded a disappointing 77, while Honorary members of the Asian Tour, Vijay Singh of Fiji and South African, Ernie Els, shot 75 each.
Choi's first birdie of the day came at the second when he blasted exquisitely out of a greenside bunker to about six feet before rolling in the birdie putt. On the 13th, he hit his wedge shot to inside four feet for a comfortable birdie and he had another one on the 15th.
Thongchai birdied the third from 12 feet and then hit his tee shot to inside five feet for a birdie on par-3 fourth. He double bogeyed the fifth and sixth but got back a birdie on 13th to finish at 73.
South Korean amateur, the 20-year-old Lee Chang-Woo, winner of the Asia-Pacific Amateur had a tough time, carding a round of 80 on the first day.
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