I don't know how it goes outside of the states, although i assume it's the same type of deal..

In TEAM sports, you're part of a league, whether it's NFL, MLB, NHL, NBA etc.. and you have businessmen who head those leagues.. their job is to create the schedule for the upcoming season.. In the NFL there is a formula where let's say if you finished first in your division, the next season you play every other team who finished first in their division (the previous year) and then it's just matchmaking by divisions from there.. But the point is that you have businessmen creating these schedules to put on the best show week by week..

In boxing it's completely different, which is why it's hard to even compare it with team sports.. Each boxer has a manager, promoter etc.. It's divided by weight classes, and anyone from any country can fight anyone from another country so long as the contract is signed.. It's not like you have a structure or set schedule or any obligation to fight anyone besides the "mandatory contender" rule which that is even avoided at times.. Boxing is a completely different machine because there is not set schedule, and you're dealing with one fighter, not a whole team.. and unfortunately it is mostly up to THAT fighter(and his management) to make the decision on who he fights, not a group of people/promoters making them fight the best.