In the US, this is how it goes:
Right of Center:
High School Sports
Left of Center:
Boxing is not on the list, but my guess is that it would be a more left wing in the US due to WWE and UFC being on the left side.
Note this is a few years old now, but I am not sure how that would affect things.
Interesting considering UFC/WWE are typically depicted by the media as being right wing, but the audiences tend to be mostly left wing. Monster trucks and Soccer/football are also something a little surprising to be more left-wing. Basketball does not surprise me as being the most left-wing major team sport considering it's a center for activism.
I describe myself as a little dose of toxic masculinity.