Juan Martin del Potro of Argentina beat local big server John Isner 3-6, 6-1, 6-2 to win his third title at the ATP Citi Open tennis tournament.
It was the 14th straight victory for the Argentine Sunday, reports Xinhua.
"I'm surprised to win this tournament," said del Potro.
"I'm looking forward to Montreal, Cincinnati and the US Open," said the World No.7.
"This gives me big confidence to keep trying and getting closer to the top guys."