Defending champion Davis Riley, who is playing the first two rounds with Scheffler, had two double bogeys on the front nine and shot 3-over 73 on the cozy course made famous by Ben Hogan, the only player to win Colonial in consecutive years (1946-47 and 1952-53). Riley is coming off a runner-up finish to Scheffler at the PGA.

The Charles Schwab Challenge begins Thursday at Colonial Country Club in Fort Worth, Texas. Split-tee action begins at 8 a.m. EDT. PGA Championship winner Scottie Scheffler and defending Schwab winner Davis Riley (along with Daniel Berger) go out at 1:45 p.m.

Tour rookie John Pak fired a 7-under 63 on Thursday and holds a three-shot lead after one round of the Charles Schwab Challenge at Fort Worth.