I started to modify couple month ago, for sure with the start screen (picture). By now I programmed original ATP score- and statboards, added courts (modified Virtua Tennis courts), a new GUI and other things. At the moment I try to fix a problem with resulution but code's sometimes weird. Unfortuanly, my mod works only at full screen and on HD (1920*1200) at the moment. But I'll try to fix. Release is end of 2013 / 2014, maybe before season will begin.
I am looking for other modders to exchange ideas or sth else.