HUMBLE, Texas (AP) -- Australian Adam Scott shot a course-record 9-under 63 on Thursday, and then went straight to the clubhouse for medical treatment after his first round at the Shell Houston Open.
The defending champion took advantage of placid early conditions for a third straight spectacular round at the Tournament Course at Redstone.
Johnson Wagner matched Scott's 63 late in the day. The Amarillo, Texas, native also shared the first-round lead last year and shared the previous course record (64) with Bubba Watson.
Charley Hoffman was two behind the leaders after a 65 and Steve Stricker was three back. Phil Mickelson, one of several top players using Houston as a tuneup for next week's Masters, shot a 72 in the afternoon, when blustery wind produced higher scores.
Scott was too ill to worry about the weather, suffering since he arrived in Houston with a fever and swollen glands around his throat. He struggled to get out of bed before his tee time and visited a doctor after his round.
In between, he was practically flawless, reaching 17 of 18 greens in regulation and needing only 28 putts.
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