Here are the tee times for the first round at TPC Southwind in Memphis, Tennessee.
Race to Dubai leader Patrick Reed will begin his quest for a second World Golf Championships title of the season in the company of defending champion Brooks Koepka and Norway's Viktor Hovland at the WGC - FedEx St Jude Invitational.
World Number Six Koepka stormed to a three stroke victory at TPC Southwind 12 months ago, with Matthew Fitzpatrick, Tommy Fleetwood and Rory McIlory tied for fourth, and Jon Rahm and Ian Poulter finishing in seventh and eighth respectively.
But 2018 Masters Tournament winner Reed won his second WGC at the Mexico Championship earlier in the campaign, and he, Koepka and Hovland will get under way from the first at 12.50 in Memphis.
Spaniard Rahm, who will tee off as World Number One for the first time at a European Tour event, will be in a big hitting three-ball alongside American duo Bryson DeChambeau and Rickie Fowler, teeing off at 11.40 on the tenth.
There will be a trio consisting of eight Major Championship wins as McIlroy, who won this event in 2014, heads a compelling group ten minutes later alongside Jordan Spieth and last year's runner up Webb Simpson.
Fitzpatrick will get his week started on the back nine alongside U.S. Open champion Gary Woodland and American Ryder Cup player Tony Finau at midday, while Fleetwood tees it up with American Daniel Berger and Mexican Abraham Ancer at 11.20.
Open Champion Shane Lowry won this event in 2015 and he gets going at 12.30 from the first in the company of two time Rolex Series winner Tyrrell Hatton and former World Number One Dustin Johnson.
Two former winners of this event are joined together ten minutes later with World Number Three Justin Thomas - the 2018 champion - and Japan's Hideki Matsuyama, who triumphed 12 months earlier, joining a rising star in Collin Morikawa.
