The 34-year-old American finished 72 holes at Oakmont on one-under par 279 after a closing two-over 72 to defeat Scotland’s Robert MacIntyre by two strokes with Norway’s Viktor Hovland third on 282.
Well behind for most of the day, Spaun watched US leader Sam Burns and Australian Adam Scott stumble back while he charged back with four birdies on the last seven holes.
Spaun, the first US Open champion to bogey the first three holes in his final round, sank a 40-foot birdie putt at the par-five 12th, a 22-foot birdie putt at 14 and answered a bogey at 15 with a clutch tap-in birdie at 17 to grab the lead before rolling in the clincher at 18.
Spaun wiped tears from his eyes as spectators chanted his name when he walked off the green.
The only prior PGA Tour victory in Spaun’s career came at the 2022 Texas Open. (AFP)
