I agree with Zimmy you did a great job!
To comment on what Mario said I don't think that you were unenthusiastic, and I saw some
sparks in there where I could tell that you were engaged with what you were seeing. Just try to vary your voice cause it does tend to all sit at the same level.
I thought you enunciated really well and were very audible throughout. I could tell you knew about the teams and players.
In the pre-game talk you'll notice that your co-caster did a lot of the talking and you seemed a bit stiff when answering the questions. Think of it as a conversation, and don't just answer his questions -- ask him some too! If you can smooth transitions and build chemistry with your co-casters that would be ideal.
Also this is a silly sales technique but if you smile while talking the people who are listening can hear you smile.
Keep up the good work!