The floodgates opened after Fox's goal with Catholic freshman Anthony Cipollone and senior William Scriptunas adding scores 36 seconds apart for a 4-0 advantage with 22:21 to go.
"[Williamstown] came out with a game plan to really play defensive on us,'' said Catholic coach Sam Fox, whose team ran its unbeaten streak to 53 matches. "We sneaked one in on them and man, they played good defense in the first half. In the second half we made some adjustments.
"We started playing the ball out a little bit wider and spreading their defense out a little bit and opened up the center and we got some additional goals. Then when we got that second goal, Williamstown had to press up in an attempt to get a goal of their own and that opened up the back even more.''
Williamstown, which was unbeaten in it last 13 games, advanced to only its second regional in school history and first since 2008. Yellowjackets senior keeper Garrett Butler turned in 10 saves, including four in the first half to keep his team within striking distance.
"Charleston Catholic is just an exceptional team,'' said Williamstown coach Mike Albertson, who saw his squad outshot 16-1. "They're just so strong and they controlled the play.
"I thought we did a good job in the first half kind of containing them and slowing them down, but in the second half too many defensive breakdowns. They're the kind of team that just takes advantage of those opportunities.''
Reach Tommy R. Atkinson at tatkin...@wvgazette.com or 304-348-4811.