Brooks Koepka will attempt to extend his lead at the 2020 WGC-FedEx St. Jude Invitational on Friday as he gets in the day leading by a pair over Rickie Fowler and Brendon Todd. Koepka has not had much success considering that winning this competition last year, but this is the ideal area for him as hes attempting to prepare for the only significant of the 2019-20 PGA Tour season next week at the Tour Championship.There are plenty of chasers to watch on, consisting of Fowler (-6 ), Justin Thomas (-4) and Bryson DeChambeau (-3 ). All three played quite well at times on Thursday, and Thomas and DeChambeau have been enormous given that the PGA Tour rebooted at the beginning of June.TPC Southwind need to again play a little slower and a little softer than weve seen a few of the other courses over the last month play, and that will work to the advantage of longer hitters like Koepka and DeChambeau. Despite the terrific Day 1 efficiency, Im not absolutely sure I believe in what Koepka is selling today as he hasnt been excellent over the last year. I require more than one round of great play for him, and maybe we get that round come Friday early morning in Memphis.CBS Sports will be with you the entire way updating this story with the most recent ratings, updates and highlights below. Have a look at the live ratings at the top of this story or a more comprehensive leaderboard.