John Pak got out to a three-stroke lead after Round 1, while Scottie Scheffler sits in the middle of the pack. Check out the live scores and results.

The PGA TOUR is back in action this week at Colonial Country Club in Texas, where some of the world's top players will compete in the Charles Schwab Challenge.

Davis Riley returns as the defending champion, having shot a final-round 70 to finish at 14 under par and claim his first individual PGA Tour title at last year's event. Meanwhile, Jordan Spieth and Daniel Berger are among the bookmakers' favorites to challenge Scheffler in this year's tournament.