J.J. Spaun won the 125th U.S. Open at Oakmont with a walk-off, 64-foot birdie on the 72nd hole, a scene that instantly took a place in professional golf's pantheon of magical moments.

Spaun began the final round one stroke back of 54-hole leader Sam Burns, but the San Diego State alum ceded ground early with five bogeys in his first six holes and turned in 5-over 40. He looked to have faded from contention but wasn't done, staging a dramatic rally with a 3-under 32 on the final nine in western Pennsylvania, including back-to-back closing birdies. Spaun raised his game when it mattered most, driving the green on the short par-4 17th and two-putting for birdie. Then he split the fairway at the long par-4 18th, found the left side of the green and got a read from his playing partner Viktor Hovland's birdie putt. Spaun proceeded to meet the moment. Needing a two-putt to earn his first major title, he drained his birdie putt to post 1-under 279, two strokes clear of Scotland's Robert MacIntyre.

"We love you, J.J.," screamed a fan as Spaun arrived at the trophy ceremony on Oakmont's 18th green. He loves them back.

Read below for updates on how Sunday's drama unfolded at the U.S. Open (all times Eastern):

8:05 p.m.: It's the moment of J.J. Spaun's life, as he drains a 64-foot birdie at the 18th hole, the longest putt made by anyone this week, to secure his first major title at the 125th U.S. Open. The crowd roars and he is overcome with emotion, and for good reason. Spaun posts 1-under 279, two strokes clear of Robert MacIntyre, and the two players in the final group (Burns and Scott) cannot mathematically catch him.

J.J. Spaun is a major champion!

7:50 p.m.: Spaun hits one of the shots of his life at the short par-4 17th, finding the green (the ball passing within inches of the cup) and rolling to 18 feet. He two-putts for an easy birdie and takes the lead to the 72nd hole of the U.S. Open.

Spaun is even-par for the week, one clear of clubhouse leader Robert MacIntyre. It's down to these two players, each chasing their first major title.

7:40 p.m.: It's been a wild afternoon as it is, but the past few minutes have been especially chaotic. Robert MacIntyre has emerged as a serious contender for his first major title, closing with a two-putt par at the brutish par-4 18th to post 1-over 281 for 72 holes. It's the low score in the clubhouse, and he shares the lead alongside Spaun (thru 16).

Other contenders are rapidly fading from the picture. Hatton finds thick rough greenside at the short par-4 17th; his second shot catches more thick rough between the green and a deep bunker, leading to a bogey. Burns finds the fairway's right side off the tee at the par-4 15th and asks for relief from casual water but is denied; his second shot finds rough left of the green and he leaves his third in the rough, leading to a double bogey.

To recap: MacIntyre (in the clubhouse) and Spaun (thru 16) share the lead at 1-over, one stroke clear of Hatton (thru 17). Five players share fourth place at 3-over: Cameron Young (in the clubhouse), Carlos Ortiz (thru 17), Hovland (thru 16), Scott (thru 15) and Burns (thru 15).

7:27 p.m.: We have another logjam atop the leaderboard with four players tied at 1-over. Spaun led by one with four holes to play but finds trouble at the long par-4 15th, catching thick rough off the tee and then laying up into the rough, 83 yards out. He plays a splendid third shot to 13 feet but misses the par putt and falls back to 1-over, tied with Robert MacIntyre (thru 17), Tyrrell Hatton (thru 16) and Burns (thru 14).

We're in for a wild ride in the closing hour along the Pennsylvania Turnpike.

7:24 p.m.: Burns has a golden opportunity on the short par-4 14th, stuffing a 123-yard approach to 7 feet, but he can't convert the birdie try. He stays in a tie for second at 1-over, one off the lead, alongside Robert MacIntyre (thru 17) and Hatton (thru 15). MacIntyre got up-and-down for birdie at the short par-4 17th to move within one of the lead; he suddenly has a legitimate chance to win his first major championship.

7:09 p.m.: The momentum has spun back to Spaun, who drains a 22-foot birdie at the par-4 14th to take the solo lead at even-par. It's a remarkable rally after he plunged down the board with five bogeys in his first six holes; he rallied with five straight pars and has now carded two birdies in his last three holes.

Hatton and Carlos Ortiz (thru 14) and Burns and Scott (thru 13) all share second place at 1-over, very much alive in the tournament.

Robert MacIntyre (thru 15) and Hovland (thru 14) share sixth place at 2-over, two off the lead. They're not done yet.

7:00 p.m.: There's now a five-way co-lead at the 125th U.S. Open, and the entire field is over par at Oakmont.

Burns has just 125 yards for his third shot at the par-5 12th, from the fairway, but he misses into the left rough, pitches to 7 feet and can't convert his par putt. Burns is now 5-over for the final round and 1-over for the tournament. He's joined in the co-lead by Hatton and Carlos Ortiz (thru 14) and Spaun and Scott (thru 13).

6:50 p.m.: The leaderboard is getting chaotically crowded on the final nine of the 125th U.S. Open. Despite being 4-over for the final round, Burns is currently hanging onto a one-stroke lead at even-par for the week. Four players hold second place at 1-over, just a shot off the lead, in Hatton (thru 13), Carlos Ortiz (thru 13), Spaun (thru 12), and Adam Scott (thru 11).

Two players stand 2-over, two off the lead: Robert MacIntyre (thru 14) and Hovland (thru 12).

6:45 p.m.: Don't count out Spaun. Despite five bogeys in his first six holes, he has steadied the ship and now drains a 40-foot birdie at the par-5 12th to move to 1-over, just one off the lead.

6:35 p.m.: Oakmont bites back at the par-4 11th, as Burns makes double bogey after his 170-yard approach lands in a wall of thick rough between the bunker and the green. Playing from an awkward stance, his third shot sails over the green and his fourth trickles back over the green. He salvages his 6 but falls back to even-par for the week.

Scott has similar issues; his second shot from 130 yards sails over the green into a nasty lie, and he only advances his third shot a few feet. He limits the damage with a 14-footer for bogey and falls back to 1-over, one off the lead, as he actually makes up a shot with a bogey.

6:18 p.m: Sam Burns makes his first birdie of the day at the par-4 10th, draining a curling 10-footer. Burns is now 2-under total, two strokes clear of Scott, whose 44-foot birdie try settles a few inches short.

6:12 p.m.: Although play has resumed, the rain has returned at Oakmont and could pose a factor for the remainder of the evening. Meanwhile, Carlos Ortiz makes birdie at the par-4 11th to assume solo third place at 1-over, two strokes off the lead.

6:03 p.m.: Burns misses the fairway left at the par-4 ninth, into the fescue, requiring a layup. His wedge spins back off the front of the green, but he salvages bogey with a deft chip to tap-in range. Scott misses the green right but chips to 3 feet and converts for par to move back within one stroke of the lead.

Burns makes the turn at 1-under for the tournament, one clear of Scott. There's now a four-way tie for third place at 2-over, three off the lead, that includes Hatton, Hovland, Spaun and Carlos Ortiz.

Burns, Scott and Hovland all shot 3-over 38 on the front nine.

5:48 p.m.: There's now just one player under par, as Scott misses the green short and right at the par-3 eighth, chips to 29 feet and two-putts for bogey. Burns' tee shot finds the rough just past the hole, and he gets up-and-down for par from 16 feet.

Burns now holds a two-shot lead. He stands 2-under, two clear of Scott. Hovland and Tyrrell Hatton share third place at 1-over.

5:38 p.m.: Play resumes with the final pairing of Burns and Scott on the tee at the 301-yard, par-3 eighth hole.

4:57 p.m.: Tournament officials announce play is set to resume at approximately 5:40 p.m.

4:02 p.m.: Shortly after Burns and Scott each make par at the par-4 seventh, the final round is suspended due to weather. Rain has arrived in western Pennsylvania, and water is gathering on several greens at Oakmont.

Burns leads at 2-under, with Scott in solo second at 1-under. Hovland and Tyrrell Hatton share third place at 1-over.

Jon Rahm is the clubhouse leader at 4-over 284 after finishing with three straight birdies. Considering the course difficulty to this point in the final round, Rahm best not depart the premises quite yet.

3:50 p.m.: World No. 1 Scottie Scheffler has hung in the periphery of contention throughout the afternoon, but his chances are severely derailed by a three-putt bogey from 9 feet at the par-4 11th. A birdie would have moved Scheffler within five strokes of the lead, but he's now seven back.

3:45 p.m.: Burns is back in the lead after a two-putt par at the par-3 sixth, as Scott hits the front of the green but three-putts for bogey from 38 feet, missing an 8-footer for par.

Burns leads at 2-under, with Scott in solo second at 1-under. Hovland (solo third at even-par) is now just two strokes off the lead.

3:35 p.m.: Scott, 44, is now co-leader at the U.S. Open. He makes par at the par-4 fifth to stay at 2-under, while his playing partner Burns finds a left fairway bunker and is forced to lay up, leading to a two-putt bogey.

Burns and Scott share the lead at 2-under, with Hovland in solo third at even-par.

3:20 p.m.: Burns' lead is down to one stroke, as his playing partner Scott stripes his second shot to the back fringe on the par-5 fourth and two-putts for a birdie. His eagle try nearly drops, but cuts across the hole on the left side. Burns' second shot catches a greenside bunker; he splashes to 40 feet and two-putts for par.

Burns is 3-under, Scott is 2-under, and Hovland moves into solo third place at even-par with a magnificent short iron to 5 feet for birdie at the par-4 fifth.

3:00 p.m.: Burns survives the difficult par-4 third, playing it to near-perfection by finding the fairway, green and two-putting from 18 feet. His lead is now two shots as Scott misses the fairway at the third and is forced to lay up, leading to a bogey.

Burns (3-under) and Scott (1-under) are the only two players under par at this juncture. J.J. Spaun added a bogey at the third, his third straight to begin Sunday, and now stands even-par. Hovland, Carlos Ortiz and Tyrrell Hatton share fourth place at 1-over.

2:40 p.m.: Don't count out Cameron Young. The New York native is 2-under through four holes in the final round, and he has moved to 1-over for the week, four back of leader Burns, who three-putts for bogey at the short par-4 second hole.

Scott holds solo second after a two-putt par at No. 2, now just one off the lead. J.J. Spaun suffered a brutal break at the second after his wedge struck the flagstick and bounded back off the front of the green, leading to his second straight bogey to start the day; he's now two off the lead.

2:30 p.m.: It's a strong start for 54-hole leader Burns, who hits the green in two at the par-4 first and two-putts for a comfortable par. Burns' lead is now two strokes, as his playing partner Scott does well to save bogey. From the penultimate pairing, J.J. Spaun made bogey at the first as well. Burns leads at 4-under, with Scott and Spaun in second place at 2-under.