When you sweep your opponent,right before they get all the way up do an uppercut.The game will think that your opponent is already up.
NOTE:This will be tricky for Raiden since he teleports to get up.

If you wanna do a fire ball standing press forward 2,high punch. To do the biycle kick hold lowkick 3sec. To do the low fireball press forward2 x. To do the fireball while in air is jump forward 2 and high punh.last is the speed high kick press forwad 2 and highkick I hope I helped

SO you want find noob saibot eh hes a hard beatin warrior so you just have to beat 50 matchs of 2player combat it well take a while if you beat you get him