BLOOMFIELD HILLS, Mich. — Curtis Luck was walking along the course, doing the math on how he’d turned a close U.S. Amateur final into a rout by winning eight holes in a row.

It was hard for the 20-year-old Australian to process.

“I think I started laughing, walking down the fairway,” he said. “I haven’t heard of that, and I haven’t seen it before. What an amazing thing to do while you’re out in the final of the U.S. Amateur Championship.”

Luck built a commanding lead with that eight-hole run shortly after the midway point of Sunday’s final match, and he went on to beat Brad Dalke 6 and 4 to become the U.S. Amateur’s third international champion in four years.

The 36-hole final on the South Course at Oakland Hills was all square after 18, and Dalke won the first hole after the break. Luck answered with an eagle on the 20th to square it again, and that was the start of a decisive streak that eventually left him 7 up with nine holes remaining.

“It’s so rare to be able to do that, especially in match play, which is, as you know, one hole at a time — you win one and things can change so quickly,” Luck said.