i assumed both tv's will have their own sound via hdmi cable??
Err no, whilst you can send the sound via HDMI you've only got one HDMI port on your graphics card, you would also need a second sound card. Odds are you'd have one on your motherboard, at which point you could send the sound via HDMI to one TV (using the sound chip on the GPU) and send the sound via coax / 3.5mm / component to the other TV (using motherboard sound card, depending on the connectors). The real sticking point on this is that you would have to be using application that can dictate the sound mixer.
What software are you using to stream the football matches? Is it just a browser?
In which case, Windows will probably only show up one instance of the browser (even with 2 windows on different screens). You can use different browsers, eg one running in Firefox and one in Chrome then they at least show up with separate volume controls in the windows mixer (I've tried this).
But unless you are using specific streaming software that allows you to specific a particular audio output directly from the software, then you won't be able to separate the audio for 2 TVs.
Besides, listening to two commentaries at once will be horrible on the ears.
As an alternative, if you are watching something with commentary on radio, you could listen to the radio commentary and watch the pictures.
What sort of situation requires TV matches on at the same time and two commentaries streamed from the internet? Are they not on TV?
