I think the difference has to to with the particular meaning of the typewriter sentence.
In the latter example, the sports match, you are talking about a hypothetical, something that can, but will not necessarily occur. Can suggests the possible, but is mute about the probable. The phrase will be able also may be used to convey that theoretical possibility.
In the first sentence, you are not talking about a theoretical state of affairs, but a predicted achievement that you fully expect to realize.
I will be able to use a typewriter perfectly after a few more lessons, just you wait and see!
The word perfectly and a few more lessons makes this a very specific predicted outcome, rather than just a possibility.
If you were talking about a more general condition, say, under what circumstances can a person learn to use a typewriter perfectly, you could say
You can learn to use a typewriter perfectly after only a few lessons.
This is again theoretical, not predictive of a particular outcome.