O'Shea scattered nine hits while striking out five in the victory. Steve Collins took the loss, with relief from Corey Dougay.
The Chevies were led at the plate by Avery Arsenault, who was 4-for-4 with three runs. Scott Ellsworth and Troy Coffin each picked up two hits while Desi Doyle was 1-for-2 with two RBI.
Dougay had a pair of hits, including a two-run home run, to lead the A's, while Dan O'Shea stroked a double and triple.