Left - hander J.A. Happ ( 17 - 4 , 3.34 ) will start Saturday .
Aaron Sanchez ( 13 - 2 , 2.92 ) is on tap Sunday .
Left - hander J.A. Happ ( 17 - 4 , 3.34 ) will start Saturday and Aaron Sanchez ( 13 - 2 , 2.92 ) is on tap Sunday .