With Jose Sanchez on the mound, the Suns mounted a comeback in the second inning on Russ Triplett's two-run triple, but that would be as close as Hagerstown could get.
The Shorebirds struck back in the bottom half of the inning with run-scoring hits by Gary Cates and Duncan, taking a 5-2 advantage, and blew the game open with seven runs in the fifth inning off Matt Durkin and Rafael Cova.
Sanchez (0-1), a control artist who has earned comparisons to Yusmeiro Petit, lasted just two innings, allowing five runs (two earned) and six hits, walking two and striking out none.
Delmarva's Kevin Hart (1-0) allowed three runs (one earned) and four hits in six innings, striking out nine while walking two.
The Suns need to bounce back in Game 2 Friday behind right-hander Mike Devaney to force a Game 3. If the series gets that far, Blake Eager will be on the mound to try and send Hagerstown further in the postseason.