Edouard Roger-Vasselin will meet qualifier Ernests Gulbis in an unlikely ATP final of the Delray Beach International Tennis Championships after they beat the top two seeds in Saturday’s semi-finals.

France’s Roger-Vasselin upset top-seeded John Isner 6-4 4-6 6-4 while Gulbis edged veteran Tommy Haas 6-3 4-6 7-6 (7-2).

The 15th-ranked Isner could never find his form against Roger-Vasselin, who was playing in his first career ATP World Tour semi-final.

Latvia’s Gulbis, who won the title in 2010, moved into a tournament final for the first time since 2011, when he won in Los Angeles.

Gulbis is the fifth qualifier to reach the Delray Beach finals. The others were Marinko Matosevic of Australia (2012), Evgeny Korolev of Uzbekistan in 2009, Kei Nishikori of Japan in 2008, Alex Calatrava of Spain in 2000 and Andrew Ilie of Australia in 1998.

Nishikori and Ilie won the titles when they reached the final.

“It is the first outdoor tournament after the indoor season,” Gulbis said. “Qualifiers have one small advantage as they’ve played already three matches while the main draw guys haven’t played a match yet.

“That’s why there’s a lot of upsets here.”

It was another chilly day in South Florida and the wind was swirling in the Gulbis-Haas clash. In the third set, as the wind died down, the quality of the tennis picked up.

“The beginning was tough and it’s not easy to play in those conditions,” Haas said. “When it becomes that windy you’re whole game plan, whole mood changes and you have to play different tennis.

“In the third set the wind was much better.”

Gulbis is known as a talented player who has never found consistency in his game. He’s also known for losing his temper when matches aren’t going his way.

On Saturday against Haas, he competed to win in adverse conditions and didn’t lose focus.

“There is no old Ernests,” said Gulbis, who laughingly addressed his better attitude. “Experience. (It’s) when you lived a quarter of a century.”