Speaking during the trophy presentation, the 23-year-old said: "It was amazing. It's been amazing coming here every year and playing that tournament means a lot to me.
"I'm really happy to go through that match in such a way. There's some good matches ahead to Wimbledon and I'm excited for the time ahead."
Dimitrov is the only player on the ATP tour to have won a tournament on all three playing surfaces in 2014, having won the Mexican Open and BRD Nastase Tiriac Trophy earlier in the season.