Appel, who improved to 2-5 and lowered his ERA to 9.74, hadn’t made it past five innings in his sluggish season.
But the No. 1 pick in 2013 was strong against Stockton as he tossed six innings while giving up five hits and striking out seven.
After Appel allowed a leadoff double to start the game, the right-hander retired the next nine batters.
Appel allowed a pair of runs in the fourth but finished on a high note as he struck out two in his final inning. Appel’s encouraging outing spanned 74 pitches.
Lancaster (61-42) scored all five of its runs with two outs.
After Roberto Pena notched an RBI single in the fourth, Jon Kemmer smacked a run-scoring double before scoring on an error.
Pena added an RBI single in the eighth before Jack Mayfield hit an RBI double in the ninth.
Gonzalo Sanudo, Juan Minaya and Jamaine Cotton combined for three scoreless innings out of the bullpen.
Cotton worked the ninth to gran his ninth save.
The teams continue their four-game series today at 7:05 p.m. Lancaster will send Lance McCullers to the mound.