Exactly what Lee said . Petes first tournament after wimbledon was the Canadian Open and this tournament was just like putting his feet into water before going for the big splash . We all know , Pete put more emphasis on slams more so than the other tournaments .Another reason is that there wasn't as much incentive to do well here than there is now with the increased prize money and points to be earned by competing at this event . I remember when half of the top ten players wouldn't even show up to this tournament .
He almost did win it in 1995 when he was in the final and won the first set against Agassi. I didn't see the match so I don't know what happened (did Andre hit more aggressively and go for his shots, did Pete's form dip etc). But I think the Canadian Open traditionally had slower courts than Cincy and the Open so it also wasn't as tailored to his game. And as was mentioned before, while he certainly could have won it if he put his mind to it and prepared properly I guess it just wasn't enough of an incentive and he viewed these events mainly as preparation for the U.S. Open.