I've heard a lot of people suggest pasta quite a few hours before sports as it provides a lot of good energy, without any type of sugar high... Anything with some good complex carbs will be decent..

Hatton has a big english breakfast was fried sausages and bacon and eggs, so I suppose having something you enjoy and keeps you relaxed and zoned in might be okay if you think you're going to be very nervous all day...

I would probably struggle to eat anything the night of a fight, but I would force something good in there so I don't run out of Energy.

Drinking a lot of water throughout the day will be a BIG help as well... When I was training very hard and eating well, one thing that really helped my training at one stage was staying very hydrated throughout the day.. I got a lot less tired, and my muscles had less fatigue.. Don't drink to much before the fight though or you'll have to pee or feel bloated.