It’s going to be difficult for the final round of the 2021 PGA Championship to top what transpired on Saturday as Phil Mickelson (-7) and Brooks Koepka (-6) rose to the top of a stacked leaderboard on Ocean Course at Kiawah Island.Might as well try, though, right?The stage is set for what should be a magnificent Sunday. Mickelson, Koepka and their nine combined majors will play in the final pairing together, and while the day will be all about one of them jumping a rung in the major championship-winning club, there are plenty of other storylines as well. Jordan Spieth (E) could go on a tear early in the day like he did at the 2018 Masters and scare the top of the board. Major champions Louis Oosthuizen (-5), Bryson DeChambeau (-2) and Gary Woodland (-2) are all well within striking distance as well.As always, the Ocean Course will play the leading role at this tournament, and after Saturday, I’m not sure what more we can ask to see. Majors have a way of topping your expectations, though, and after an incredible first three rounds, what unfolds in the finale of the second major championship of the year could be beyond belief.Watch Round 4 of the PGA Championship streaming live beginning at 1 p.m. ET on CBSSports.com, the CBS Sports App and Paramount+. CBS Sports will update this story with scores and highlights below. Check out the live scores at the top of this story, a more detailed leaderboard, Round 4 tee times and our complete viewer’s guide.