American fifth seed Tommy Paul beat compatriot Sebastian Korda 6-4, 7-6 (2) in the semifinals at the Queen's Club Championships on Saturday and will face Italian Lorenzo Musetti for the title on Sunday.
Paul, 27, becomes the first American finalist at Queen's since an all-American final in 2010, when Sam Querrey beat Mardy Fish to lift the trophy.
Paul, who was the only seeded player in the semifinal lineup, has reached the second ATP 500 final of his career.
He will face Musetti in the final after the Italian moved past Australia's Jordan Thompson 6-3, 3-6, 6-3 earlier on Saturday.
"It was one of the toughest matches of the week," Musetti said. "Jordan was playing amazing, especially in the second and third sets. It was a really tough match. I am really proud of my achievement. I love this sport."
Musetti has reached his first ATP Tour final on grass to complete the set of finals on all three surfaces.
He joins Matteo Berrettini, Andreas Seppi and Lorenzo Sonego as the only Italians to reach ATP Tour finals on clay, grass and hard courts.
Jannik Sinner also achieved that feat in Halle earlier Saturday by beating China's Zhang Zhizhen to advance into the first grass-court final of his career.