Is there anyway to call it quits and retire a gladiator?

After MoonChild's last 3 fights I think he has reached the apex of his fighting career.

In his last 3 fights he has defeated Muscle Meatbag, Thunder Lips and Laphroaig!

The no doubt 3 most devastating gladiators in the game.

3 up 3 down. What a way to go out, taking out the top 3, in a row.

I fear, he can in no way achieve any feats of greater distinction. It's all down hill from here.

So proud, but yet bittersweet.