Davis Cup team mates Sam Querrey and John Isner set up an All-American Memphis Championships showdown with contrasting semi-final victories on Saturday.
Eighth seed Querrey held off Latvian Ernests Gulbis 6-3, 6-4 after the sixth-seeded Isner outlasted German Philipp Petzschner 7-5, 4-6, 6-3.
The pair will face off for the Memphis title on Sunday before teaming up to represent the United States in a Davis Cup tie against Serbia in Belgrade on March 5-7.
Querrey, who ousted top seed and defending champion Andy Roddick in the quarter-finals, evened his career record with Gulbis at 1-1 with his victory, which included 11 aces.
World number 25 Isner converted three of 11 break points and delivered 13 aces to win his first meeting with Petzschner.
The tall American is off to a 12-1 start this season, including his first tour title at Auckland in January.