Croatia reached the Davis Cup final after Borna Coric beat Frances Tiafoe in over four hours to secure a 3-2 victory over the United States.
Croatia began the day with a 2-1 lead, but Sam Querrey beat Marin Cilic 6-7 (2-7) 7-6 (8-6) 6-3 6-4 to ensure a deciding rubber in Zadar.
Coric then outlasted Tiafoe 6-7 (0-7) 6-1 6-7 (11-13) 6-1 6-3 to send Croatia into their first final since 2016.
They will face defending champions France, who beat Spain 3-2.
Cilic and Coric both won the opening rubbers in straight sets to put Croatia in a strong position after the opening day.
America’s Mike Bryan, 40, who retired from Davis Cup tennis in 2016 along with his twin, Bob, returned to partner Ryan Harrison for Saturday’s doubles.
The duo prevailed in a five-hour epic to beat Ivan Dodig and Mate Pavic 7-5 7-6 (8-6) 1-6 6-7 (5-7) 7-6 (7-5).
Both sides, along with France and Spain, are guaranteed a place in next year’s revamped Davis Cup.