The Fightin Phils dropped their fifth straight game Saturday night, losing 5-2 in New Britain.
The Fightins lost despite outhitting the Rock Cats 9-5 in the game.
Perci Garner (4-4, 4.14) surrendered five runs in six innings of work to take the loss.
Aaron Altherr and Anthony Phillips each hit RBI singles for Reading.
The Fightin Phils (33-38) will look to avoid the sweep on Sunday when they wrap up their series in New Britain at 1:35pm.