UPDATE 1-Tennis-Croatia upset U.S. 3-2 to reach Davis Cup semis

* Cilic beats Blake to steer Croatia into semi-finals

* Bryan wins dead rubber to make final score 3-2 to Croatia

* Croatia to play Czech Republic at home in semis

(adds last match, quotes, byline)

By Zlata Zsolnay

POREC, Croatia, July 12 (Reuters) - Croatia powered into the Davis Cup semi-finals when Marin Cilic beat James Blake of the U.S. 6-3 6-3 4-6 6-2 in the first reverse singles on Sunday.

"This is one of the biggest matches of my career and I think I played great from the start to the end," said Cilic whose success gave the home side an unbeatable 3-1 lead.

"It got a bit complicated in the third set when my legs felt a bit heavy and Blake took the initiative, but with the great help from the supporters I managed to regain my strength."