Boswell scored off Dwayne De Rosario's corner kick in the 77th minute. De Rosario sent a bullet from the right corner toward the net, where Craig Waibel crossed it from the right to the left of the goalkeeper's box. A charging Boswell kicked in a right-footed shot.
Ashe made it 2-0 after getting a cross from Brian Mullan from the right side to the left. Ashe headed it past goalkeeper Miguel Calero
Pachuca, which won Superliga last year in penalty kicks over Los Angeles, appeared to have scored in the 59th minute. Gabriel Caballero was whistled offside by referee Neil Brizan.
Houston lost to Pachuca twice previously in international competition. In last year's CONCACAF Champions Cup semifinals, the Dynamo fell 5-4 on aggregate in the two-leg series. In last year's Superliga, Pachuca prevailed over the Dynamo at Robertson Stadium, 4-3 on penalty kicks after the teams played a 2-2 draw.