All time is probably Arlovski.
- 6 fight win streak, UFC champion. Loses twice in to Tim Sylvia.
- Goes on another 5 fight win streak - Loses 5 fights in a row.
- People write him off and say his chin is completely shot and should retire
- Goes on a 10-1 run with the 1 loss being against Anthony Johnson who breaks his jaw and despite that, doesn't get KO'ed in the fight
- Loses another 5 fights in a row - People say he's completely done now
- Wins 2 in a row and then drops another 3 in a row - More talk that he's finally done
- Trades wins and losses for a bit and then wins 4 in a row
- Now he's back to 2 losses in a row
He's been a decision machine and not the most exciting guy to watch but his longevity is pretty amazing. Especially when you saw all of his brutal KO losses only for him to keep coming back and going on win streaks.