Well i just got my hands on this game and was really taken by it, congratulations guys and keep up the good work. I saw some of the suggestions the other guys made and some are really good while others you can find in other tennis simulation games who put a lot more emphasis on graphics. I didn't have time to read all of the posts so please excuse me if some of my suggestions have already been out there.
I'd like to see more variety on returning serve. I like to play serve and volley and also doubles so serve is all important to me. Here's something interesting i noticed: players never return serve into the net, they either return long/wide or in court. This is a real must-fix as in the real game about 50% of all points won directly from serve go into the net, especially in doubles where service is king and usually the players are quite poor on return. Also i have not seen players being put off balance by serve and return high (to give an example: you can't come to the net to serve and volley and just smash a high ball in, when CP returns it usually is a low ball and you can only do a low volley) or return short (just come forward and put in a short return while the CP is stranded in one side of the court or the center). It would be great if you could give us more variety on returning serve but i don't know if this would be possible due to game engine limitations.
This however should be possible. I've read most guys want more options to customise players and i do agree, sometimes a little thing like that can add a lot more to your pleasure for the game. Here's what i think would be great and would very much like: why not make the players titles screen more attractive? I mean everyone i'm sure likes to look back and see all the titles he's won over the time and that simple list of just having them listed there is kind of ugly. I think it would be very nice if you would have a more interactive menu over there with more details; for example instead of just listing the tournament type, name and year won i think it should also contain the surface, opponent in the final and score. And when i said interactive menu i meant that it would be really cool if you could sort your statistics to show for example your tournaments won by surface type, year, importance etc. Also could make the different tournaments appear in different colours like on the atp tour: gold for masters, silver for atp 500, white for atp 250 etc.
And also please no more shouting fault when the ball lands into the net!