The Phillies followed an 8-5 victory in the opener with a 15-10 decision in game two for a 2-0 lead in the title series.
Game three of the best-of-five set is scheduled for 10 a.m. today at Kerr Field.
In the opener, Gieski racked up 12 strikeouts in a nine-inning, complete-game performance.
Keck drilled a three-run homer and teammate Ray Stillwell laced three hits and drove in a pair of runs.
For the Bluerocks, Scott Freeze (3-for-4) and Ted Miller (2-for-3, three runs scored) paced the attack.
In game two, Keck powered a two-run homer, Bob Malin lofted a three-run blast and finished with four RBIs and teammates Mike Pralle and Stillwell combined for four hits and seven runs scored.