What pitch?

change low and away or fastball up and in

A curve that doesnt curve,left hanging up and in.

Pretty much the pitcher missed his spot but its likely still a strike with curveball rotation on it

The fastball, change up combination.

agreed...
curve, split, knuckle, you can read the spin/dot whatever and wait back, but change/fastball should look the same....being harder to hit...

To hit the ball, the most challenging is a slider or cut fastball. To get a hit is definently the knuckle ball for the most challenging!!!

a change up is by far the hardest if the pitcher throws hard enough....if he throws it low and away it is unhitable, the pitcher has to keep his same motion down though or you can tell its a change up, but the change up is the hardest i think

a cutter or slider is the hardest pitch to hit i mean it looks like a fastball but moves out like crazy and can by just as fast on a slider there is something called the eye but if the pitch is fast enough u might see the eye and a cutter there is no eye its a fastball they breaks out making it hard to hit

No the hardest pitch to hit has gotta be a hard pitched overhand curve ball that starts behind your head and comes in low and inside.

lh 2 seam fb that starts off about 2 hit you then come right back on the corner (for a rh hitter)

its got to be the changeup. and who ever said the hanging curve up and in is hard to hit is out of their mind lol.

a changeup low and away following an inside fastball.

my knuckle curve lol

i don't think you can say there is one hardest pitch to hit. It all depends on what kind of pitcher is throwing (i.e.- over-the-top, 3/4, sidearm) and how effective he uses his fastball. The sickest pitch I have ever seen was a side arm knuckle ball from a guy who was throwing 80+ over-the-top all game.