As far as "look across" is concerned - I don't know what you meant by it. Did you mean that you think that Team G will lose. If so, then perhaps you could say that you "overlook" Team G, as if to say you are going to ignore them completely because you don't think they'll win.
"Look ahead" can be used if you're perhaps saying that you are looking into the future and perhaps predicting the score of Team A's game. However, if you're excited about Team A's next game, then you would use "look forward to".
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