It was Tsonga's second consecutive title as he won the ABN Amro World Tennis Tournament in Rotterdam last week by defeating then-world number 11 David Goffin.
Jo-Wilfried Tsonga outlasted defending champion Nick Kyrgios on Saturday to make it an all-French final at the Open 13 Marseille. Victory also marks a real return to form for the 2016 US Open quarter-finalist.
Tsonga is in his second straight final, having won the title in Rotterdam last week and will face the victor of the second semifinal between his countrymen Richard Gasquet and Lucas Pouille.
His success sets up an all-French final against Lucas Pouille, who overcame compatriot Richard Gasquet 7-5 6-3.
"I've seen referees wait five, six seconds even when the ball's gone out", Kyrgios said.
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The 31-year-old Tsonga was the first player to break Kyrgios this week to take the first-set tiebreaker and earned another break in the decisive set to prevail in two hours, 12 minutes.
"Jo is right back on form and I'm glad to be playing him tomorrow".
Another forehand long from Del Potro gave Raonic a 7-6 lead and the Canadian won a third straight point to reach his first final of the season. "I'll need to serve well to beat him", Pouille said.
Tsonga came through before Kyrgios showed his power to force a decider but his opponent's experience was too much as the home favourite progressed to Sunday's showpiece.