Two-time defending champion Jo-Wilfried Tsonga set up an all-French showdown against second seed Gilles Simon at the ATP Moselle Open in Metz.
He came through against eighth-seeded Florian Mayer of Germany, 4-6 6-2 6-3 to reach the final in his first tournament back since suffering a knee injury at Wimbledon.
The world No 8 had also needed three sets to beat Germany's Tobias Kamke in Friday's quarter-finals.
In the first semi-final, Simon was invincible on serve as he beat countryman Nicolas Mahut 6-3 7-6 (2) to stay on course for his first title of the year.
For the second consecutive match Simon did not face a single break point.
Simon, who lost the Eastbourne final in June, broke Mahut in the fifth game and took the first set against serve when Mahut planted a weak shot into the net.