After reading other threads like this i went back and watched the Fed-Murray wimbledon SF. With a stopwatch i timed how much actual tennis there was with the ball in play, including faults.
There was only 22 minutes of actual play in a 127 minute match. About 17%! This was the same as another article i read somewhere that did the same thing. When you think how much the ball is in play with other sports like soccer or rugby league this is pretty bad.
The biggest waste is sitting down every few minutes for a 90 sec break at change of ends. This is crazy for pro athletes, especially playing BO3 sets. (different for BO5) The average amount of actual play in every 2 game block between rests was less than 1.5 minutes! Then you sit down for 1.5 minutes.
I think for BO3 every second change of ends is just that, like they do after the 1st game of set - no sit down break for 90 sec.
I hate lets, but they dont waste much time compared to other things, i would hate to lose match point with a let.
I do think no-ad scoring has potential. Im not sure why a single game has to drag on for 10-15 min? I can imagine the excitement each time a game gets to deuce for a deciding point. That would be cool!
I hate the 4 game set idea. Someone mentioned earlier playing a tiebreak at 5 all instead of 6 all for a 6-5 set, thats a good idea i think. No need for 7-6.