Spain's Feliciano Lopez saw off former champion Grigor Dimitrov to set up an Aegon Championships final against Croatian fourth seed Marin Cilic.
Unseeded Lopez beat Bulgarian sixth seed Dimitrov 7-5 3-6 6-2 in the second semi-final at Queen's Club.
Cilic, the 2012 champion, had earlier defeated Luxembourg's Gilles Muller 6-3 5-7 6-4.
Jamie Murray and Bruno Soares play Cilic and Marcin Matkowski in the doubles semi-finals later on Saturday.
Cilic is aiming to be come the first man since Pete Sampras in 1995 to win both the singles and doubles titles.
More to follow.