Two consecutive days of rain delays will wear on a man.

That and dropping three championship points. Either way, Pablo Cuevas had had enough. Serving in San Paolo for the Brazil Open title on Monday, he took an uncustomary step by serving underhand on his second serve.

His foe in the final, Albert Ramos-Vinolas, was taken off guard, to be sure. Standing behind the baseline to return serve on red clay, he couldn't have fathomed Cuevas' fourth-time's-the-charm tactic. After a rally of a few strokes, Ramos-Vinolas struck a shot long and Cuevas secured the title, his third in a row at the event.

This tactic is rare, but it's nothing new. Late last century, both Martina Hingis and Michael Chang served underhand in French Open finals.

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They've got nothing on Gael Monfils' latest move, however.

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What can be considered gamesmanship or shoddy sportsmanship is another dart (or shuttlecock) in the quiver of a tennis pro. If this whatever-it-takes mentality gets a player the victory, who's to spite it? If you hate it, beat it.

Or maybe I've just served underhand in a few many USTA 4.0-level matches recently, sore shoulder, psyche and all.

Follow Jon on Twitter @jonscott9.