Following a bizarre Round 4 at the 2019 AT&T Pebble Beach Pro-Am on Sunday that included a hail delay, this tournament is a one-and-a-half horse race. Going into Monday's two-hole finish Phil Mickelson (-18) leads Paul Casey (thru 15 holes) and Scott Stallings (finished) by three strokes each.

Mickelson and Casey were the only pair not to finish their round on Sunday after the stoppages for inclement weather, and they'll kick things off on Monday morning at 11 a.m. ET. 

Mickelson played fabulous golf on the back nine on Sunday as he surged into the lead with three birdies in the first seven holes on that side to go with a 33 on the front. He's staring a 6-under 66 to win a record-tying fifth Pebble Beach Pro-Am right between the eyes.

After a par on the 16th hole, Mickelson actually tried to finish his round in the dark, but his playing partner Casey wasn't having it. So Casey will start his Monday with a 3-foot putt on the 16th for par, and Mickelson will start his with a tee shot on the par-3 17th, which is where he ended his day on Sunday, shaking his head as the horn blew to stop play.

Stallings played great golf on Sunday with a 6-under 66, but Casey did not have the greatest day. He's even for his final round after coming in with a healthy lead, but a four-hole stretch from No. 10 to No. 13 saw Mickelson play it in 2 under and Casey in 2 over for the four-shot swing and all the momentum in the tournament. He'll need to finish birdie-birdie (after making par on No. 16) to even have a prayer of getting to a playoff.