I'm trying to register for an upcoming USTA tournament. I have never done this before so I am not familiar with some of the abbreviations on the web site. For instance, with this tournament here: http://tennislink.usta.com/tournaments/TournamentHome/Tournament.aspx?T=84548 Next to divisions, what does M(Op,55)s,SE; W(Op)sd,SE; M(Op)d,SE; X(Op)d,SE; NMW(3.5,4.5)sd,SE all mean? I obviously understand the 3.5 and 4.5 as NTRP ratings but what is the M OP, SE, W OP, X OP, NMW all mean? Also, it says players are selected manually by the tournament director. How does said director decide who plays and who doesn't? Is it just random? Usually are the chances slim of getting into tournaments like this? Lastly, do they just trust people to self rate themselves as far as NTRP goes. If someone was a 5.0 or 5.5 and joined a 3.5/4.5 tournament what would happen? Not saying i'm going to do this, just curious. Sorry for all the questions, just not familiar with tournaments like these. Thanks!