I gotta say that I find TEM a really great and addictive game, but I have noticed a couple of things I would suggest for a future version.
1. I've noticed that in Fed Cup that you play the Doubles before the reverse singles, when in real life the doubles are the last match. I presume that you are simply having the game treat it the same as Davis Cup for simplicity (ie. more code reuse), but it would be nice to have the format match real Fed Cup matches.
2. I've noticed that the game strangely seems to treat Fed Cup as being a single event as opposed to multiple events. ie. I have been able to spar with players who are actually in other Fed Cup ties.
3. I also think it should be possible to have multiple sponsorship contracts (ie. clothing, rackets, non-sports contacts, etc.) Obviously you shouldn't be able to have more than one contract for the same thing, but once a player gets very well known s/he should be able to have a non-sports sponsorship contract.
4. I believe someone else mentioned this already, but I think it would be neat to offer historical schedules (ie. the actual tournaments that were played year X) in addition to the standard default schedule. Obviously, one couldn't change between schedules once you started a game, but it would be neat to have both as an option.
5. Maybe I am missing something, but once the tournament starts there doesn't seem to be a way to drop out of the event. In real life players drop out of doubles all the time to focus on singles so I think there should be an option to drop out of doubles to focus on singles.
6. I think it would be interesting to have Hopman Cup as an option for a tournament. Obviously this would require that there be a concurrent mens and womens circuit going on in the game, but it would be an interesting addition considering that Hopman Cup has been around for quite some time.
7. Have mixed doubles as an option for the Grand Slams. Again, obviously like with the Hopman Cup idea it would require the game to have both men and women in the same game, but it might be interesting.
8. The Olympics. I know this one has already been mentioned, but I figured I would give it a plug anyways since the ATP has been giving points for the Olympics.
9. There doesn't seem to be an easy way to look at your W/L record for past years. You can see the activity and manually calculate your record, but I don't see a way to get said information at a glance.
This is definitely a unique game and probably the best $25 I paid for a game, but I just figured I would give a little feedback of what I might like to see in a future version.