Sylvain Grenier is a French Canadian professional wrestler who performs in World Wrestling Entertainment on its RAW brand.

Grenier (pronounced Grahn-yay) was born in Montreal, Quebec in 1977 and as a young man was involved in baseball, tennis and hockey. He's been an active wrestler as well in Montreal's nCw, known as Sly. He went into modeling as well and it was while in Florida at a modeling shoot that he met WWE agent Pat Patterson . Patterson quickly realized that this young, muscular athlete could be a wrestler and invited him to a WWE event. It was there that Grenier got in a WWE ring for the first time and impressed WWE officials enough to get a contract with Ohio Valley Wrestling.

He made his debut on a WWE PPV not as a wrestler but as a referee who pretended to be knocked out in Icon vs. Icon match 2. At a certain point Grenier threw a steel chair to the Rock who then used it against Hulk Hogan. Grenier soon was in the center of the ring with Vince McMahon and the Rock celebrating. One month later during the match "20 years in the making" Grenier ran down to the ring to officiate in the Hogan-McMahon match. Hogan would have none of it and promptly threw Grenier over the top rope.

He debuted in WWE as a wrestler with fellow Quebecois René Goguen (wrestling as René Duprée) as the heel tag team La Résistance, billed as a French team at a time when many Americans resented the French government for its perceived lack of support in the "War on Terror". A third wrestler, Rob Conway, was later added to La Résistance.

In March 2004, the stable was broken up when Goguen was "drafted" in a "lottery" by WWE's other brand, Smackdown!. However, La Résistance still exists as a team featuring Grenier and Conway. WWE now bills the team as French-Canadian. Thier tag team finisher is the dreaded Au Revoir.

Highlights of Grenier's WWE career came a when he won the WWE World Tag-Team Title's once with Dupree, then with Conway in Grenier's home town of Montreal to a standing ovation.