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A grueling schedule continues for the PGA Tour's top golfers when the 2021 WGC-FedEx St. Jude Invitational tees off Thursday at TPC Southwind in Memphis, Tenn. The 2020 Tokyo Olympics tournament just wrapped up, the British Open was just three weeks ago, and the PGA Tour's FedEx Cup playoffs start in two weeks. But 66 of the world's top players, including 48 of the top 50 in the Official World Golf Ranking, will be in action for this WGC event. That includes Olympic gold medalist Xander Shauffele and fellow Team USA golfers Collin Morikawa and Justin Thomas. Bryson DeChambeau will play this week, while world No. 1 Jon Rahm is out after both tested positive for COVID and had to withdraw from the Summer Games.   

Brooks Koepka, who won this event in 2019, is the 12-1 favorite in the latest 2021 WGC-FedEx St. Jude Invitational odds from Caesars Sportsbook. Morikawa (14-1) and Schauffele (14-1) are right behind, followed by defending champion Thomas (16-1), Jordan Spieth (16-1) and Rory McIlroy (18-1). Before locking in any 2021 FedEx St. Jude Invitational picks or any PGA Tour predictions, you need to see what proven golf insider Sal Johnson has to say.

A media legend and consummate golf insider, Johnson knows what it takes to win on the biggest stage. Before the 2020 Tokyo Olympics golf competition, he listed Schauffele, Morikawa, McIlroy and Hideki Matsuyama among his top five golfers. 

Schauffele gutted it out on the final holes to win the gold medal at 18-under par, while the other three went 15 under and competed in the seven-man playoff won by C.T. Pan of Chinese Taipei.      

Johnson has been on fire all season. Before the Open Championship, he said Morikawa would win if he could "overcome his poor putting." He did just that, saving par several times to win his second major championship.   

And before the U.S. Open, he tabbed Rahm among his best bets to win and touted Oosthuizen at 45-1 as his top long-shot candidate. Rahm and Oosthuizen battled to the finish, with Rahm surging to his first major title. 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 WGC-FedEx St. Jude Invitational golf picks, and they will surprise you. You can only see Johnson's expert PGA Tour picks at SportsLine

Top 2020 2021 WGC-FedEx St. Jude Invitational golf predictions

Shockingly, the golf expert is fading Schauffele after his gritty performance in Tokyo. The combination of the emotional victory and the long trip back make it unlikely the 27-year-old will be at the top of his game. It was his first win since January 2019, so the chances he will contend again this week are slim. He tied for sixth at Southwind last year but was T-27 in 2019. Johnson has several options in mind for this week who have more sustained track records.

On the other hand, Johnson knows Spieth has been going through quite a resurgence. The 28-year-old three-time major winner went almost four years without a victory before winning the Valero Texas Open in April. That was the first of five top-10 finishes over his past eight events, and he was outside the top 20 just once in that span. He is second in FedEx Cup points and ranks 11th in scoring average (69.909) and seventh in par breakers (24.69 percent). Spieth is putting well, ranking 31st in strokes gained and seventh in overall putting average (1.567 per hole).   

Johnson also knows Dustin Johnson is having a messy season but could break through at any time. The reigning FedEx Cup champion and No. 2 player in the world didn't go to Tokyo, so he won't be run down like many of his competitors. He also has a strong history at TPC Southwind, winning the St. Jude Classic in 2012 and 2018 and finishing T-12 last year. He missed the cut at the 3M Open but was T-8 at the British Open, shooting 68 or better in three rounds. He is third in scoring average (69.658) and eighth in driving distance (312.8 yards). 

How to make 2021 WGC-FedEx St. Jude Invitational golf picks

For this week's event in Memphis, Johnson is backing a long shot with a great track record at Southwind who comes in at higher than 30-1 odds. This golfer is great from tee-to-green and can make all the putts he needs. Anyone who backs this underdog could cash in huge. You can only see this WGC-FedEx St. Jude pick only at SportsLine.

Who wins the WGC-FedEx St. Jude Invitational 2021? Where do Morikawa and Thomas finish? And which huge long shot is a must-back? Check out the odds below, then visit SportsLine to see Sal Johnson's full leaderboard, picks and analysis for the 2021 FedEx St. Jude Invitational, all from the insider who knows what it takes to win on the biggest stages.

2021 WGC-FedEx St. Jude Invitational odds, field, top contenders

Brooks Koepka 12-1
Collin Morikawa 14-1
Xander Schauffele 14-1
Jordan Spieth 16-1
Justin Thomas 16-1
Rory McIlroy 18-1
Dustin Johnson 20-1
Daniel Berger 22-1
Louis Oosthuizen 22-1
Viktor Hovland 25-1
Bryson DeChambeau 25-1
Patrick Cantlay 25-1
Hideki Matsuyama 25-1
Scottie Scheffler 28-1
Paul Casey 30-1
Webb Simpson 35-1
Matthew Fitzpatrick 35-1
Tony Finau 35-1
Patrick Reed 35-1
Cameron Smith 35-1
Shane Lowry 40-1
Harris English 45-1
Tyrrell Hatton 45-1
Abraham Ancer 45-1
Tommy Fleetwood 45-1
Jason Kokrak 45-1
Corey Conners 45-1
Joaquin Niemann 45-1
Will Zalatoris 50-1
Sungjae Im 55-1
Brian Harman 55-1
Sergio Garcia 55-1
Justin Rose 55-1
Adam Scott 55-1
Sam Burns 66-1
Marc Leishman 70-1
Ian Poulter 70-1
Billy Horschel 70-1
Phil Mickelson 70-1
Cameron Champ 70-1
Cameron Davis 80-1
Robert Macintyre 80-1
Ryan Palmer 90-1
Matthew Wolff 90-1
Kevin Kisner 90-1
Max Homa 100-1
Lee Westwood 100-1
Si-Woo Kim 100-1
Stewart Cink 100-1
Carlos Ortiz 100-1
Garrick Higgo 100-1
Kevin Na 125-1
Lucas Herbert 125-1
Lucas Glover 125-1
Min Woo Lee 125-1
Kyoung-Hoon Lee 150-1
Matt Jones 150-1
Martin Laird 200-1
Aaron Rai 200-1
Victor Perez 200-1
Wilco Nienaber 250-1
Wade Ormsby 250-1
Jim Herman 300-1
Ryosuke Kinoshita 300-1
Robert Streb 300-1
Brad Kennedy 500-1