PORTLAND, Maine — The Reading Fightin Phils emerged victorious over the Portland Sea Dogs in the opening series, winning the the third game, 10-2 Sunday at Hadlock Field.

After the Sea Dogs won the season opener, the Fightins outscored Portland 21-2 in the final two games of the series.

Zach Eflin, making his Phillies organizational debut, picked up the win for Reading. Eflin, who was acquired by the Phillies in the trade that sent Jimmy Rollins to the Dodgers, pitched six shutout innings and allowed just four hits while walking one and striking out two.

Brock Stassi homered for the Fightin Phils for the second straight game, blasting a three-run shot over the Sea Dogs bullpen off of Simon Mercedes in the sixth inning.

Mercedes struggled in his first Double-A appearance, allowing six earned runs in three innings of relief. Stassi finished the series with eight RBIs for the Fightin Phils.

Reading also notched five doubles in the game, including two each from Carlos Alonso and Art Charles. Reading got the scoring started with a pair of two-out, two-run hits — first by Cam Perkins in the third, followed by Carlos Alonso in the fourth.

Sea Dogs starter Mike Augliera (0-1) got the loss, allowing four runs (two earned) on five hits through 3 2/3 innings.

In the process of taking the final two games of the series, Reading at one point scored 19 unanswered runs against the Sea Dogs. Portland had been held scoreless for 18 consecutive innings until Jantzen Witte delivered an RBI single in the eighth inning.