Watch: 5 nastiest pitches of the MLB season

Filthy, nasty, gross, whatever you want to call them, these pitches are all unhittable.

Just over the midway mark of the season, we've seen some pretty special pitches that leave more than the hitter wondering what just happened.

Let's take a look at five that are still leaving us scratching our heads.

Wright's Knuckleball

A baseball shouldn't move this much, yet Boston Red Sox right-hander Steven Wright has mastered it. Not only is his knuckler so tough to hit, but it seems like it's almost tougher to catch. Hat tip to specialty catcher Ryan Hanigan, who is surely covered in bruises.

Chapman's Cheddar

It might seem simple enough, but if the hitter blinks, it's gone. No one in baseball throws their fastball as hard as Aroldis Chapman, who matched the hardest pitch ever recorded at 105.1 mph Monday night. The only other person to throw that hard in the radar gun era? Chapman.

Tanaka's Two-Seamer

Some pitchers have natural movement on their pitches, and if this is natural for New York Yankees right-hander Masahiro Tanaka, it's not normal. Tanaka's known for his splitter, but after delivering his whiffle-ball-type fastball, he's become that much scarier.

Sale's Slider

Chris Sale's slider is so good, hitters are swinging at it even when it's going to hit them. With his wonky mechanics, throwing his body one way while his elbow and arm go the other, the Chicago White Sox ace is scary to face, and if you're a left-hander, you don't really stand a chance.

Estrada's Changeup

It's the most underrated pitch in baseball, but man is it nasty. Toronto Blue Jays right-hander Marco Estrada turned himself into a household name when he figured out how to throw the changeup. Not only can he spot it up, but he literally sends batters to their knees when they try to hit it.

(Videos courtesy: MLB.com)