Cueto throws in the mid-90s and gets a ton of groundballs. Throughout his career, he has exhibited reverse splits, but this season he is getting batters of both hands out about an event amount of the time.
Consider Leake the Reds pitcher the Rays are most likely to exploit. He tends to struggle with lefties, which makes sense given his stuff (a high-80s fastball, a cutter, and a plethora of other pitches).
If Leake is the starter most likely to be exploited by the Rays, then Volquez is the starter most likely to exploit himself. Control issues limit otherwise good stuff, and have even led to a demotion earlier this season. Batters of both hands have on-base percentages over .350 against Volquez for his career.