1st match[edit]
Glass Joe can be defeated by blind aggression. If he blocks your punch, just switch your guard and keep pounding. He likely won't give you any trouble at all once you're familiar with the controls. Knock him down without getting hit and he won't even get up!
Glass Joe can be defeated in less than 30 seconds with the "Right Cross." As shown in attract mode, it's possible to counter a left jab from most opponents with a well-timed right to the face. When done properly, the punch goes over the opponent's jab, stunning them, and allowing you to pile on even more straight rights.
Glass Joe is particularly vulnerable to hook punches when he is attempting a combination. If you block a jab from Glass Joe, you can immediately throw one or more hooks - you'll hit him out of his next punch.
Title defense[edit]
Glass Joe is no longer trivial to defeat. He has some of the same traits, such as being too slow to act. He has all the same moves, except he has a new response to a left jab: a lightning-fast right cross that you will be unable to block or dodge. He will not always throw it, especially early on, but leading with a left jab is just too risky now.
Unfortunately, Glass Joe will not leave himself open so much anymore. If you don't know what to do, you can easily go two minutes without knocking him down once. It's still relatively safe to throw body blows, but he will often block them. It may be best to hit him with a body blow when he jabs (before he can actually throw it) and possibly when he's about to throw a hook.
Glass Joe's biggest vulnerability is KO punches. He won't dodge or counter them too often, so you're relatively safe throwing a few of them although he will hit you with counters sometimes.