The seven-furlong event for Ontario-sired two-year-olds was the first added-money tally for the Porto Foricos gelding, who is trained by Lorne Richards and owned by K.K. Sangara.
After bobbling just after the start, Shut It Down regrouped and rallied to take the lead a furlong out, going on to a 5 ½ length score. Wildcat Fashion, who lost by a head in the Bull Page Stakes, rallied for second. Vandal Stakes winner Win and Reign was third.
Ridden by Tyler Pizarro, Shut It Down watched Hawkey Star carve out the first quarter in :23.06. Heading into the turn, Shut It Down, seventh after a half in :45.42, began to gain momentum.
When the leaders faltered, Shut It Down pounced, recording his second triumph from five starts, stopping the teletimer in 1:22.21.
"Lorne told me he's a little nervous, so just sit on him and take it easy," said Pizarro, who celebrated his fourth stakes win of the campaign. "He just broke a little slowly. There was a lot of speed, so if we could sit off it (the lead), we would sit off."
The dark bay finished second in his debut on July 27 at the Toronto oval, before a second-place finish to Mean Green in the Simcoe Stakes on September 1. After a maiden-breaking six-length romp on September 26, Shut It Down weakened down the lane to finish fourth to Mean Green in the Bull Page Stakes on October 13.
Richards, who purchased Shut It Down for Sangara from Mark Casse after his career bow, was pleased with the authoritative win.
"Mark really liked him and thought he'd work out for me," said Richards. "He was good enough to steer me that way."
Shut It Down paid $24.20, $10.10 and $5.20, combining with Wildcat Fashion ($5.40 and $3.50) for a $109.50 exactor. Win and Reign ($4.20) capped a $418.10 triactor.