I figured it out
there are two ways to beat expert (my way)
one: cheating
stand next to the corner and get hit and thus, rung out. the cpu will keep on chasing you, even into the void, giving you the fakest win of your life
two: pressure by corner
move forward when the round starts, and react to the opponent with parries and jabs. you'll win space, and eventually get to ring him out as long you have shields