Defending champion Bryson DeChambeau headlines a PGA Tour field loaded with former major champions when the 2021 Rocket Mortgage Classic tees off Thursday at Detroit Country Club.   

William Hill Sportsbook lists DeChambeau as the 15-2 favorite in its latest 2021 Rocket Mortgage Classic, followed by Patrick Reed and Hideki Matsuyama at 14-1.

Before you lock in any 2021 Rocket Mortgage Classic picks or PGA Tour predictions, you NEED to see who golf insider Sal Johnson is backing.

A media legend and consummate golf insider, Johnson has a tremendous feel for how the players and courses fit together. Before last year's Rocket Mortgage Classic, he was locked in on DeChambeau before the bomber's debut in Detroit. 

"This is a course he should eat up and play great on," Johnson said before the event. "Look for him to break out with a possible win."

The result? DeChambeau crushed it all weekend and didn't shoot higher than 67 on his way to a 23-under week. He fired a 7-under 65 on the final day to beat Matthew Wolff by three strokes. Anyone who has followed Johnson's advice has cashed in HUGE!  

Now Johnson, the first producer of "Inside the PGA Tour," a longtime ABC Sports golf producer who worked with Jack Nicklaus, Arnold Palmer and Greg Norman, and the founder of the world's top golf stats database, has released his highly confident 2021 Rocket Mortgage Classic picks, and they will surprise you.

Shockingly, the golf expert is fading Will Zalatoris, who is among the top five favorites at William Hill at 25-1. The 24-year-old stormed onto the scene with top-eight finishes in three of the first four events to start the season. Then he was the runner-up at the Masters in April and tied for eighth at the PGA. But he has T-59 and two missed cuts in his last five events, and he is making his Rocket Mortgage debut. There are many other choices you can choose to wager on, and Johnson isn't sold on Zalatoris this week!

Instead, Johnson is touting a MAJOR long shot who comes in at well over 40-1! This player has taken a strong liking to the Detroit Golf Club, and his game appears to be coming around quickly. He could pull off a massive victory this week, and you'll want to profit from it, too! Anyone who backs this underdog could cash in HUGE.

Who wins the 2021 Rocket Mortgage Classic? Where do Bryson DeChambeau and Patrick Reed finish? And which MONSTER long shot is a MUST-BACK? ... Join SportsLine now to see Sal Johnson's full leaderboard and picks for the 2021 Rocket Mortgage Classic, all from the insider who NAILED last year's Rocket Mortgage Classic!