OK, I was led here from your other post.
Scott (namasste), as is usual for him, and Kevin have you going in a great direction.
It looks as if you were fortunate to have a bit of cloud present for this shot, but as was noted, you did quite well with it technically 'in-camera' (the accidental "-1/3"slip up aside).
I can add that I have had a 20D since they came out and had the 70-200 f/4L and a Canon 1.4x TC. First of all, my experience with the TC it was better to shoot without unless I had a situation similar to yours in this pic where I could actually prefocus on a spot or subject well before I shot.
I set up my 20D and a 70-200 f/4L with 1.4x TC on a tripod aimed at the batters box (softball) and I would pre-focus on the batter as they stepped into the box and then turn the AF off (on the lens). I then could sit back in a lawn chair with a remote shutter release and just work on timing the pitch right to get "BOB" (ball on bat) shots and it worked out really well.
Conversely, using the TC in a fast moving environment like HS school age soccer, it just could not focus fast enough and my keeper rate suffered with the TC compared to without it. I found I was merely trading the ability to shoot one part of the pitch for being able to shoot another part of that was merely further away and not appreciably larger. And since the TC hindered AF speed, it only resulted in less keepers.
The other negative with the TC is that when you have the aperture set to shoot as wide open as possible, you're losing a full stop with the 1.4x and two full stops with the 2x so you'll need decent light or you'll be into ISO's above 400 which may start to degrade image quality (introduce 'noise').
So, the TC may have a place in some sports shooting situations, but the advantages may have a negative associated with them. You just have to decide if it's better for you.
I ended up selling my 70-200 f/4L to get the f/2.8L. I had to sell the 70-200 f/4L, my Tamron 28-75 f/2.8 and add another $200 to get the 70-200 f/2.8L. I wanted better low-light capability and I wanted to get more "OOF" (out of focus) backgrounds. The first issue was significantly remedied and the latter issue was made better, though the difference wasn't huge, it was enough to make it worth it (better separation of subject from background). If these are not a concern to you, the 70-200 f/4L is an excellent lens as you've so aptly demonstrated with thew pic you've posted here.
The suggestion I have that I have not seen mentioned is that while the technical qualities of the shot are quite acceptable to say the least, I would suggest that you make an effort to time your shots to include a ball, preferably as it strikes a bat of just before someone catches it.
So long as you maintain the attitude you have about accepting help, your learning curve will be much shorter.
Canon 20D w/grip, 300D, Powershot SX100 w/HF-DC1 flash, Canon 70-200 f/2.8L, 85 f/1.8, 17-55 f/2.8 IS, 50 f/1.8, 580EX and some other stuff...