De La Cruz had two hits to extend his hitting streak to 12 games.
Roa (1-1) allowed an unearned run, four hits, a walk and struck out six. Myles Gayman pitched three scoreless and hitless innings in relief. Donovan Benoit allowed a run in the ninth.
The first-place Dragons (34-15) have won three straight games and lead Great Lakes, an 8-7 loser to Fort Wayne on Saturday, by 7.5 games in the Midwest League East Division.
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