Breaking: J.J. Spaun wins the 125th U.S. Open for the first major title of his career. Spaun, 34, entered the week having never finished higher than 23rd at a major championship.

The final round of the 2025 U.S. Open is underway at Oakmont Country Club, as players look to cap off an exciting week with what figures to be an exhilarating Sunday. But another story that has been a key to this week's narrative could once again come into the picture during the final round: Weather.