In celebration of boxer Naoya Inoue's 30-0 professional record (as of his victory yesterday, May 4, 25), what are some anime whose plots are centered on combat sports? Please note, I'm not looking for anime like Dragon Ball and Yu Yu Hakusho in which the characters sometimes take part in martial arts tournaments. I want anime that are really about characters pursuing the sweet science and/or its cousins from around the world.