Top seed Gael Monfils was pushed all the way by John Isner before reaching the final of the Legg Mason Tennis Classic in Washington.
A lengthy rain delay saw his semi-final against American Isnercontinue into the early hours as his powerful-serving opponent put up a tough fight.
Isner fired in 19 aces but Monfils eventually prevailed 6-4 3-6 7-6 (8/6).
The Frenchman must now hope the late night does not cost him in the final, where he will face the unseeded Radek Stepanek, who completed a 6-3 6-3 victory over Donald Young in far more routine fashion.
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