Hersey will make a repeat appearance in the Mid-Suburban League boys water polo championship game after wrapping up an outright East Division championship.
The Huskies will meet Palatine, which finalized the West Division title.
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Hersey sealed the deal by topping visiting Wheeling 11-6 at Olympic Pool on Wednesday.
George Vladimirov scored 4 goals to pace the Huskies (15-2, 9-0), and Jack Carroll had 3, while Nate Reiff and Noah Ihde had 2 apiece to lead Wheeling (10-13, 5-4).
Palatine delivered an impressive 15-4 win at Barrington.
Kristiyan Kalev led the way with 7 goals for the Pirates (13-3, 9-0), Omar El Hoffi had 3 and Wally Kleinfeldt drew three exclusions.
Second-place Barrington dropped to 16-5 overall and 6-3 in the West.