Defending champion Matteo Berrettini saw off Botic van de Zandschulp to reach the final at Queen's.
The Italian second seed beat the Dutchman 6-4 6-3 despite a lengthy wait to take to the court and a mid-match rain delay in London.
He will face either Marin Cilic or Filip Krajinovic on Sunday.
The bad weather meant no play was possible at the Birmingham Classic, with the two women's semi-finals set to be played on Sunday.
Simona Halep will play Beatriz Haddad Maia before Sorana Cirstea takes on Zhang Shuai.
"I guess this is the UK, no?