I suppose there's Squash, which is basically tennis but the "net" is the wall. In this case, I won't be surprised if this sport is an extension of the Mario Tennis game, given the similarities between them.
Another sport, if it could be called that, is footracing. The idea that Mario characters do racing on their foot is not fully realised, since the Super Mario platformers tend to be more of the cooperative side. The SMB Deluxe game does have the You vs. Boo games, but I am referring to actual racing around the course.
In terms of the extreme and/or chaotic version of the sports presented in Mario Strikers and the Camelot Mario games, I would like to see Rugby. It's true that Mario & Sonic 2016 has this sport, but I feel that this sport is ripe in a more cartoon-y version (for lack of a better word). The sport as presented in Mario & Sonic has its own twists, but more could be done to it. Such as turning the rugby ball into something more explosive, or perhaps giving the field some conveyor belts (in one of the courts).
Thank you for reading.