(Detroit, MI)  --  Davis Thompson came out hot on the first day of the Rocket Mortgage Classic in Detroit.  In just his third PGA Tour event as a pro, Thompson shot a bogey-free nine-under 63 to jump to the top of the leaderboard at Detroit Golf Club.  Brandon Hagy is among a group two-strokes back at seven-under.  Defending champion Bryson DeChambeau is nine strokes back at even par.