Tom Berzins cracked 124 as Sparsholt ran amok, totalling 342 against depleted Havant II in Southern Premier Division 3 at Locks Lane.
He hit a six and 17 fours, enjoying a century-plus stand with Brad Dawes (68) while Jack Fuller (35) and Matt Robbins (32) played useful support roles.
Left-arm spin all-rounder Steve Matthews, with a 3-56 return and top score of 47, was Havant's keynote player, while Ollie Perkins (37) helped the reply to 161.
Callum Doran (3-27) and Fuller (3-27) shared six of the Havant wickets.
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