Anilrgowda

Knockout: Easy win:
Stand directly behind your opponent and beat them up. When they get ready for a punch, freeze and they will not hit you.

Move penalty machine in Football:
After selecting "Football" at the game selection screen, select the penalty machine. When saving penalties, use the D-pad on controller one and move the Left Analog-stick around. This will move the penalty machine. You can now move the machine wide and make it shoot. To make it shoot, press X.

Table Tennis: Easy win:
When you are hitting a ball back to your opponent, spin your forearms around very fast and you will not miss it.