Please help me figure out the meaning of the phrase "contender bracket" in the following sentence from the description of the app "Rowdy City Wrestling":

> 
> You can Work your way up through the Rowdy City Wrestling **contender
> bracket** by facing opponents in boisterous one-on-one bouts and
> multiperson rumbles.
> 
> 
> 

Here is a description of the app from [Google Play](https://play.google.com/store/apps/details?id=com.stencyl.rowdycitywrestling&hl=hi&gl=US):

*In career mode you will start as a nobody and fight your way towards the RCW World Championships. It's not going to be an easy journey, you will fight in 1 vs 1 matches, six person brawls and royal rumble events. The aim of the game is to earn cash to improve your stats so you can take on the guys at the top.*