Dana likes to talk about Renan alot recently but Sean was 31-1-1 when GSP made him scream "AAAArgh" with the same armlock Jon just used on Glover.
It happened a few minutes before Georges gave him a hellbow to the nose to end the fight.
The only fighter to beat Sean up to that point was the reigning UFC WW champ and future hall of famer, Matt Hughes. Matt wasn't able to stop Sherk in that fight though.
TS, something else that might interest you is Sean only lost to current/future Hall of famers: Hughes, GSP, Baby Jay and Frankie Edgar.