Riverside junior attacker Andrew High responded with two goals in the last five minutes to help the Rams win their fifth consecutive district title, 9-8.
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Riverside used its attack to score five unanswered goals to defeat Stone Bridge 9-6 and advance to the Potomac District championship.
The Tigers cruised past the Bulldogs, 15-5, in a Potomac District showdown.
The Rams defended their home turf in a hardfought, 8-7, win over the Falcons.
The Falcons defended their home turf in a 13-8 win over the Bulldogs.
The Captains escaped the Bulldogs in a non-league matchup, 13-12.