If the game is being carried on ESPN (most ships have both ESPN1 & 2) then it will be shown.
FWIW: yes, most important games do get shown on ships, but there is no guarantee. It won't hurt to inquire as soon as you get on board so the right people get the message that this is an important game to Americans. Sometimes the Crew doesn't always know what games we want to see - but they wouldn't miss a soccer playoff for anything.
If it is on a channel they can access they will do it.
the Spirit has some small sports bar area behind the blue lagoon. it fills up quick so does most of the sports viewing areas so your best bet is get there early and have a few libations while you wait
Home Lines Doric 78, Oceanic, Homeric 85,Celebrity Horizon, Zenith,NCl Pride of America 05 (Honeymoon), Spirit 09-30-06,NCL Gem 12-29-07,NCL Spirit 5-17-08
NCL Dawn 7-27-08,NCL Sky 7-3-09
NCL Dawn Sept 20,2009
Pride Of America