Filion, who has 256 victories this season on the WEG circuit, is just seven wins behind Jamieson, who after a driving double has 263 triumphs.
Filion captured four consecutive dashes from race six to nine.
The reinsman, respectively, won with the Mick Grant-trained Blue Chip Sunshine ($49.70, 1:53.2), Star Ruffnready ($5.60, 1:53.1) for conditioner James Lamacchia, the Richard Moreau pupil Aahm A Gesture ($5.90, 1:52.2) and Cee Pee Panic ($6, 1:52.3) for trainer Stephane Larocque.
The Al Tomlinson trainee, Here Comes Jenny ($54.30, 1:54.2), notched Filion's fifth win of the night in the 11th and final race.
The Milton resident is having a career year, with 396 wins and over $8.1 million in purse earnings. Lifetime, Filion has accumulated over $73.4 million in purses and had 7,151 trips down victory lane.