Very little separated Gasquet and Zverev competing in Sunday's final in a first time meeting for both.
German teenager Alexander Zverev beat two-time defending champion Richard Gasquet 7-6 (7-4) 6-3 to win the Open Sud de France and clinch his second career title.
The players exchanged a break of serve in the opening set, but it was 19-year-old Zverev who gained the upper hand in the tie-break.
Gasquet saw off compatriot Benoit Paire to reach the final.
Defeat ended world number 22 Gasquet's 10-match winning streak in Montpellier. Paire had broken Brown's serve for a 1-0 lead.
The powerful hitting of Zverev was taking its toll on the four-time champion, but he was able to cope well as the second set was moving along routinely, service games competitive, but no breaks or break points achieved by either player.
Zverev soon became increasingly frustrated that he was unable to continue dictating from the backcourt as he had at the start of the match. I'm very happy the way we played.
"It was a hard match", said Gasquet. "It was close during the first set".
Zverev then teamed up with his older brother Mischa to win the doubles crown over veterans Fabrice Martin and Daniel Nestor.
The third set was another close affair, with few break points on offer, but with Tsonga serving at 4-5 to stay in the game, Zverev pounced to earn a break and match point, snatching it immediately to secure a 6-7 (6-8), 6-2, 6-4 victory.
Zverev hit 32 winners and 32 unforced errors compared to 17 winners and 24 unforced from Gasquet.
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