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Question:  When should the toss be made to determine who serves
first?

Answer:  The toss should be made
before warm-up so that the players
can warm-up on the same side from which they
play their first game.
Question:
After tossing a ball to serve, the server decides not to hit it and catches
it instead.  Is this a fault?
Answer:  A player, who tosses the ball and then decides not to hit it, is
allowed to catch the ball with the hand or the racket, or to let the ball
bounce.
Question:  What if I jumped over the net during the point? Is a player
allowed to jump over the net into the opponent's court while the ball is in
play?
Answer:  No. You lose the point!
Question:  I hit the shot of my life and my opponents said that I lost the
point because I touched the net.  Is that right?
Answer:  You do lose the point if the player or racket, whether in the
player's hand or not, or anything which the player is wearing or carrying
touches the net, net posts/singles sticks, cord or metal cable, strap or
band, or the opponent's court at any time while the ball is in play.
Question:  Line Calls

Question:  Do I have a right to question an opponents line call?

Answer:  The call of a player looking down a line is much more likely to
be accurate than that of a player looking across a line.  When you are
looking across a line, don't call a ball out unless you can clearly see
part of the court between where the ball hit and the line.  It is difficult for
a player who stands on one baseline to question a call on a ball that
landed near the other baseline.
Treat all points the same regardless of their importance.  All points in a
match should be treated the same.  There is no justification for
considering a match point differently than the first point.
Opponent's call questioned.  When a player genuinely doubts an
opponent's call, the player may ask:  "Are you sure of your call?"  If the
opponent reaffirms that the ball was out, the call shall be accepted.  If
the opponent acknowledges uncertainty, the opponent loses the point.  
There shall be no further delay or discussion.
Question:  

Question:  Can a team be coached in between the 2nd and 3rd set?

Answer:  Yes, it is allowed to be coached during an authorized rest period.   However
rest periods do not include toilet breaks, a 2-minute set break, or a medical time out.  
USTA Comment 30.1