Visiting teams Britain, Argentina, and France all won hard-fought doubles matches to take 2-1 leads in the Davis Cup quarterfinals on Saturday.
The United States, playing Croatia in Portland, was the only host side with a chance to clinch victory late Saturday.
Jamie Murray and Dom Inglot put Britain in position to move its cup defense into the semifinals after beating Serbia’s Nenad Zimonjic and Filip Krajinovic 6-1, 6-7 (2), 6-3, 6-4 in Belgrade.
Dusan Lajovic won the second singles suspended overnight when he beat Jamie Ward in straight sets in the morning to level the tie, but Serbia captain Bogdan Obradovic decided to rest Janko Tipsarevic from the doubles and save him for the reverse singles on Sunday.
The veteran Zimonjic was paired for the first time in the cup with Krajinovic, who played with an injured wrist and viral infection but dominated the partnership.
On Sunday, Kyle Edmund has a chance to clinch a tie for the first time when he plays Lajovic.
If Britain win, it could play Argentina, which was on the cusp of an 11th semifinal in 14 years after Juan Martin del Potro and Guido Pella won their first…