The 36-year-old PGA European Tour veteran opened the tournament with rounds of 72 and 74. He parred the first two holes in the third round then came up with first ace of this tournament when his 3-iron tee shot bounced short of the green, took two more hops and then rolled into the cup.
Hedblom pumped his fist and high-fived his caddie and playing partner Stewart Cink.
When he reached the green he picked the ball out of the cup, kissed it and threw into the grandstand.
The eagle dropped him to 4 over for the tournament. After parring No. 4, he came up with his second eagle of the round when he dropped a long putt for a 3 on the 515-yard 5th.
The 3rd hole played at 216 yards for the first two rounds and was the sixth-hardest in scoring over the first two rounds at 3.38. The back tee was being used for the last two rounds.
This is Hedblom's second U.S. Open. He finished tied for 11th last year.
The last hole-in-one in the U.S. Open was by Peter Jacobsen last year on the 175-yard 9th in the third round at Pinehurst.
This is the fifth U.S. Open played at Winged Foot and Hedblom's was the second hole-in-one. Mark McCumber aced No. 10 in 1984.