In five previous events, the youthful Marseille have shown glimpses but their talents clicked into place here.
The Frenchmen were undefeated until falling short to Partizan with their dazzling run starting by emerging out of a tough Pool A, where they defeated top seeds Raudondvaris Hoptrans (LTU) and rising San Juan (PUR).
Marseille easily beat Krupanj (SRB) in the quarters before defeating compatriots Paris (FRA) in an unforgettable semi-final.
This team - aged 22 and under - are clearly making a mark on the pro circuit and you better get used to seeing Marseille contending for titles.
Thirouard-Samson, look out!: Lorenzo Thirouard-Samson has been hyped for some time and you better jump on the bandwagon.
The 22-year-old might just be the next big thing in French 3x3 with a team leading 25 points and he dominated inside to hit 74% on one-pointers.
If he can develop consistency from deep then there won't be any stopping him.
The Final: Partizan 21-Marseille 16
In a tournament full of surprises, Partizan were the only top-four seed to make the final four and they entered as favorites against the new French kids on the block.
Partizan started fast through the inside game of Nikola Lazic, while Stefan Torbica continued to make it rain.
Stefan Milivojevic and Andreja Milutinovic went bang, bang and this appeared a wrap with Partizan leading 10-1.
The fans were stunned and they looked for answers with Lorenzo Thirouard-Samson delivering to wake up Marseille then Hugo Pierre Emmanuel Cucherat scored three quick points.
Behind their passionate fans, Marseille went on a 9-2 run capped by a two-piece from Leopold Delaunay as Partizan's lead shrank to 18-16.
But there was no miracle comeback with MVP Milivojevic shutting the door on Marseille with the final three points to finish a lights out performance of 9 points and 7 highlights.
The reward: Three tickets to the Amsterdam Masters
With Partizan already qualified, Marseille, Princeton and Paris received the tickets and joined Ub Huishan NE, Antwerp TOPdesk, Amsterdam HiPRO, Beijing, Miami, Liman Huishan NE, Utrecht and Marijampole Mantinga as the teams headed to the Amsterdam Masters on October 6-7.
Final Standings: 1. Partizan (SRB) 2. Marseille (FRA) 3. Princeton (USA) 4. Paris (FRA) 5. Vienna (AUT)
Top Scorers: 1. Stefan Milivojevic (Partizan, SRB) 32 pts 2. Stefan Torbica (Partizan, SRB) 32 pts 3. Franck Seguela (Paris, FRA), 31 pts 4. King McClure (Princeton, USA), 31 pts 5. Lorenzo Thirouard-Samson (Marseille, FRA), 25 pts
Key Stats: - Top seeds Raudondvaris Hoptrans and second seeds Vienna crashed out at the quarters, while No.3 Liman Huishan NE (SRB) failed to emerge from Day One. - Liman struggled but rising star Ning Zhang dominated Krupanj with a triple-five of 11 points, 8 rebounds and 6 highlights. - Princeton's Henry Caruso continued his amazing debut season with a triple-five of 7 points, 7 rebounds and 5 highlights against Liman and he finished third in player value (31.8).