Murray wins rain-delayed, final-round battle with Cilic
The match was delayed for more than three hours by rain.
It is the 27th career title for the Briton, who also claimed the trophy in 2009 and `11, and his second of the season after winning at Miami in March.
Murray's victory came in his first tournament since he was forced to withdraw from the French Open with a back injury.
"I worked very hard in the time that I had off to try and get myself in the best shape possible," Murray said.
Murray yelled in agony in the match's eighth game after straining his groin in a stretch but kept playing without treatment.
Murray dominated the final set, going up 3-1 when Cilic made a forehand error.