Fernando Verdasco won the Pilot Pen tournament with a straight-sets victory over Sam Querrey in the final in New Haven.
The second seed saw off his American opponent 6-4 7-6 (8/6) in one hour 35 minutes.
The Spaniard's serve, in particular his second serve, underpinned his success. He won 68% of points on his second serve in contrast to Querrey's 43%.
Verdasco said afterwards: " "I think the second set was a little bit strange because I was 4-2 up, playing good.
"He was a little bit down in that moment. I was almost up 5-2 and serving. But it was such a long game and he finally he won that game. He broke me in the next game. The match changed completely. He start playing much better; I start playing a little bit worse.
"I don't know how I turned it around again, with 6-3 down in the tie-break. I was also a little bit lucky that I served two big serves. I won the two points from 6-3 to 6-5 only with my serve, and also the double-fault he made at 6-6. I think I was just a little bit lucky today."
The final was both players' second match of the day after their semi-finals were postponed because of heavy rain.