I gave up on default settings, thought I'd try and get the All Star with all characters instead, but even with a one game, 7 point, 5 serve points setup I still can't do it. I'm stuck at match 6 against Jeurgen this time. The ace serve is just not working and even if I get past him there's another 4 matches to play!!!
I'm amazed how anyone has pulled off those two achievements. Especially the default settings one.