First Name Basis

[jont]

I think you need to separate the original question of whether to address a coach by his first name from being too talkative or friendly with one of the coaches. Whether or not you know a coach personally or have had a few of their games before, either way you should not talk with him or her excessively before the game and be seen as joking around with them. However, there is no reason why you should not use their first name when talking with them if you know it and remember it. If you "chum around" with one coach and just introduce yourself to the other, the one coach may very well become upset; however, this should have no bearing on whether or not you use their first name or not.