Unless the CPU scores right after kick-off you might consider being a total douche and just time waste for the rest of the game by just passing between your defenders after you have taken the lead. That might change the outcome. As far as I know the CPU doesn't realize this and starts to press as high as a human player would. But then again, I don't think the CPU is capable of considering you a douche either
aha, I did this loads of times back in my PES5 days. LB, CB,CB,RB.. CB,CB,LB. Sometimes even being daring and including a winger or MF.