The 28-year-old won in Houston on clay in April and the Hall of Fame Open on grass last month.
In the Connecticut final he will take on Daniil Medvedev who thrashed Japan's Taro Daniel 6-1 6-1.
The 22-year-old Russian Medvedev is looking for his second title after winning his first at Sydney in January.
(Writing by Jahmal Corner; Editing by Ian Ransom)
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