I checked your System.log and there's nothing wrong except for the configuration of Joystick 2, Up . Try to set it back to a normal value.
If still not working, then rename this file "Document/Tennis Elbow 2013/Tennis.ini" to Tennis.ini.Bak ; it'll reset your settings but you won't lose your saved games.
If still not ok, then manually save your current game, start a new one and check if you can actually start a match or not, so we'll know if it's general issue, or if it's only linked to your current games.
== Mana Games ==
>> I don't answer Private Message, except if it's really a _Private_ topic <<