If he wins, Rose will replace Dustin Johnson at the top of the world rankings.
Rose quickly erased a two-shot deficit against Schauffele with four straight birdies on Sunday (NZ time) on an Aronimink course so soft from rain that tee times were pushed back three hours.
"We had a golf course we couldn't play", said Slugger White, the tour's vice-president of competition.
The plan for Monday is to tee off at 7:30 a.m. ET in threesomes off both tees, with the last group going off at 9:20 a.m.
Keegan Bradley might be there, too, all because of one putt.
The top five players heading into next week's tournament at East Lake will have the opportunity to win the FedEx Cup outright by winning the Tour Championship.
Tiger Woods is off to quite the start in the final round of the BMW Championship this morning.
As a result, our recommended way to watch the 2018 BMW Championship live online streaming without cable is via the Hulu Live TV service. The best indication of the benign nature was the fact that Tiger Woods shot a 66 and on 12-under only moved up one on the leaderboard, from a tie for 12 to a tie for 11. Why is it significant that he's falling one shy of 25 events played?
The impetus behind the rule is so that fields across the board on the PGA Tour will stay healthy and so that some of the weaker events would get to see their favorite stars and superstars at some point.
The PGA Tour has a rule called the "strength of field regulation", which requires golfers to either play 25 events in the current or previous season or add a new event in the current season (that they did not play in the prior season).