HexCheat:

 Edit the file ????????.tnm, where ? is your savegame name, and
 change the following things:

 Offset     What
 ÄÄÄÄÄÄ     ÄÄÄÄ
 000C       Round Number minus one
 0050       First Team games won
 0052       First Team games lost
 0056,0058  Second Team games won,lost
 005C,005E  Third Team games won,lost
 0062,0064  Fourth Team games won,lost
 0068,006A  Fifth Team games won,lost
 006E,0070  Sixth Team games won,lost
 0074,0076  Seventh Team games won,lost
 007A,007C  Eighth Team games won,lost