Could be a little sharper but I would guess the lighting/lens combo is more the problem than your technique. As such I won't score you down for that after all who has the more for the best lenses? not me!
good idea and framing...suggestions: shame about umpire's legs in bg. Could have cropped even further just to focus on heads and shoulders...might have made it more abstract. Coulour too yellow.......candidate for B/W?
I might have tinkered with the colors a little to get rid of some of the yellow cast to this one. It might have also been a little better to see their facial expressions.
Was the green/yellow hue a choice or an accident? To me it makes them look sickly......................... looking at the back of their heads, blurry refs legs in the background and nothing else but floor bores me a bit too. Sorry. OTOH, I do see the "strength" being shown.
The tint is a bit wrong, when the body strain it turns red, I can see the hits of the color on the bodies, but the tint it hiding it, from my point of view, making it less strong.