[danielf]

I don't know about the legalities of JS sports, but streaming something like that to your tv is possible if you hook up your pc directly to the telly and select it as an alternative AV source.

I usually use a laptop showing the streamed event for this. If you have a desktop on another floor, it's going to be difficult. You'll need a very long av cable. Or a laptop.

Either way, the content is unlikely to be full screen on the TV. In my case, it's usually half the TV screen, but still better than watching a computer screen.