I'd like to weigh in with more than a little advice for Mains and Deemax, advice that should go a long way toward lengthening your baseball careers. DROP THE DARNED SPLITTER!!! You guys don't need it, but since you can throw it ok, you think you've got this incredible out pitch. Neither of you is old enough to know how to PROPERLY pitch yet, let alone throw such a dangerous pitch. Learn to throw a good fastball and changeup with identical arm speed, angle and action. Go ahead and learn a proper curveball as you go along, but stay away from a slider at your age, and especially STAY AWAY FROM A SPLITTER.
What neither of you realize, and with all due respect to Thepainguy, is that a split finger fastball places a great deal of stress on the Ulnar Collateral Ligament of your elbow. There have been more pitchers who've had to undergo Tommy John surgery due to learning this specific pitch than any other pitch in baseball. When the ball is leaving your fingers on a properly thrown splitter, there is a tremendous amount of stress on the UCL, in part due to having the fingers split apart and the ball coming off the inside tips of those fingers while the arm is so tight. Try this, spread your two fingers apart like you are going to grip a splitter, while holding your other hand over the inside or medial side of your elbow. You'll feel the muscle contract and everything tighten up just from opening your fingers with no ball and no throwing stress. That extra stress is enough, when thrown over and over, to damage the UCL and end your throwing days.
Before those of you who are disagreeing with Texan and 08dad jump on me too, I come from a little bit different perspective. I've run a very successful summer baseball program for 7 years, with many of the better high school aged pitchers from this region playing with me. NONE of them throw a splitter. They've all learned how to throw fastballs, changeups and a breaking ball. Many of them are now pitching in college. Our family also has a relative who pitched briefly with two American League teams, and had his 6 year pro career come to an end when he tore his UCL shortly after adding a splitter to his arsenal. He had to have Tommy John and didn't have a succesful comback from it, and ended his pro career at 27 years old. Finally, I have a son who has undergone Tommy John surgery, thanks in large part to that darned split-finger pitch. My son is a catcher, but WAS (the operative word is WAS) also a pitcher. He had a little better than average fastball, a very good changeup and a so-so curveball. He decided, against my constant disagreement, to also throw a splitter. Yeah, it was filthy and he struck a lot of guys out with it, but it was doing damage to his elbow all along. He wouldn't listen to his dumb dad and fell in love with the split. Last year, exactly one year ago today, as I write this,, he was behind the plate in a tournament in southern CA, and when throwing down to 2nd base between innings, felt a "pop and burning sensation" in his right elbow. That was the last time he threw a baseball until last week.
Since last January 15th, we've battled insurance companies and medical groups to get who we felt is the best TJ surgeon in our part of the country. That took months, time away from the game my son loves so much. He had his surgery on September 27th by Kenneth Akizuki, the doctor we wanted all along. I had to pay cash for the entire operation as our insurance wouldn't cover it due to our medical group insisting we go to someone they refer to, even though he had far less Tommy John experience. It was very expensive, but worth every penny I paid. My son has had no pain since the surgery, has full range of motion and his rehab is going very well. If all continues to go well, he'll step on a baseball field sometime this summer, after missing more than a year. He'll start playing Jr. College baseball next fall, after missing his senior year of high school and what would have been his actual freshman year of college baseball. We've pretty much been through hell and back with his injury, as it relates to his baseball dreams. He'll come back just fine in all liklihood, but he'd be the first person to tell you that it was hell, and if he had it to do over again, he never would have thrown a splitter.
So, I have a question for both of you pitchers who throw the splitter. Do you really think it is worth it? Are you willing to make a deal with the devil in the hope that you won't have arm problems? If you are, and want to stay with the split, let me offer you one very important piece of unsolicited advice. Pitchers get drafted by professional baseball clubs because of their ability to throw FASTBALLS. They don't get drafted because they have a great slider, changeup or SPLITTER. They get drafted because of their ability to throw fastballs. The same thing goes with college recruiting. Go learn to throw what matters, and learn how to pitch the right way.