Back to back draws are not that common in boxing. Recently Mario Barrios fought to a draw against Pacquiao and also drew in his last fight as well. Who are some other fighters that have two or more draws in a row on their record?
I cheated and went for the low-hanging fruit. In other words, I just pulled up a bunch of Argentine records and in no time flat saw that Nicolino Loche, Carlos Monzon, Miguel Castellani and Avenamar Peralta all met this criteria
Langford has 11 back to back draws and a few times he got 3 draws a row. Draws were much more common before a judging was clearly established but at the same time a lot weren't traditional draws. Also there used to be 4/6 round fights with top guys and in those sort of fights a 2-2, 3-3 is highly likely. Now virtually every fight of consequence is a minimum of 10 rounds.
You needed a 3 point lead to win in Argentina. It made boxers take on harder fights early instead of feasting on lesser opponents until they're confident. Which was better for their career in the long run. The downside being you had to totally dominate an Argentine in their homeland.
So for a 4 rounder fighter needed a shutout? 6 rounder needed 5-1? 8 rounder needed 6-2? That is really something.