Boxer vs Sim is 6-4, Sim’s favor.
Until you learn how to play the matchup, it sucks balls though and Barlog’s that know the matchup can exploit weaknesses in your defence that can really mess you up. In my opinion, the best way to play the matchup is to keep Boxer at about 3/4 screen away and use a lot of fireballs to try to force boxer to use one of his tools for getting around them, because his tools are so easily punished. You’ll seriously get messed up if Boxer gets in close, but don’t panic. Just relax and watch for throw attempts and remember if you eat a combo into ultra, you still have a chance to get out and turn the match around.
The main reason I think Boxer is screwed in this matchup is because he doesn’t have many good tools to get in:
Turn around punch’s invincibility frames is funky with Sim’s fireball speed. A lot of boxer’s will get caught by fireball and if you’re playing a zoning game at about 3/4 distance, even if boxer times it right, you can severely punish Boxer with super, ultra, standing hp, standing mk, you name it. Vary your fireballs to keep boxer honest with when to use turn around punch.
Boxer can headbutt through fireballs, but that doesn’t really do much for him in the long run and your fireball game should be continually forcing him into the corner. Just keep advancing after fireball with lk slide and zone accordingly to push him there.
ALL rush punches can be Yoga Tower’d. Expecting a rush punch or at 3/4 screen and see one coming? Yoga tower, then knockdown and teleport out or b.throw and put boxer right back in the same position.
Is boxer turtling? Walk forward and move back and forth a little to bait him to lose his charge.
Standing HK is great for zoning out a boxer who tries to jump over fireballs. Even beats his neutral jumping hp in some cases.
A lot of boxers will try to build meter to EX rush punch through a fireball. This is great, let them try. You can bait out an EX rush punch with yoga fire FADC back and then either ultra, slide, yoga tower, whatever. There’s also a sweet spot where you can throw out lp fireballs safe and if boxer tries to EX rush punch or ultra through it, you have enough recovery time to lk.slide into super. The spacing doesn’t look like you should be able to recover in time, but you can. It’s sick.
Buffering lk slide into super is relatively safe against boxers and the super won’t come out unless you hit them. If a boxer does an EX rush punch and you have super, it’s free damage.
I use to hate this matchup, now I love it. It’s especially great seeing boxers get frustrated as you shut down every option they have to get in.
BTW - I’d say one of the most annoying things a boxer can do to Sim when he gets in is crouching jab, walk forward, crouching jab, repeat. It creates pressure and a pretty good guessing game as far as if he’s going to throw or not, and one jab can lead to combo into ultra. If boxer does something like c.lp, c.lp, at this point you have enough pushback from boxer’s jabs to mash out b.lk, b.mk xx fireball and create space. It’s the boxers that only do one jab then walk forward, etc that I get nervous playing against.