Notable fighters who lost their first pro-bout

[XviciousX]

Henry Armstrong KO by 3 Al Lovino
Bernard Hopkins L4 Clinton Mitchell
Alexis Arguello TKO 1 by Cachorro Amaya
Wilfredo Vazquez L4 William Ramos
Rafael Marquez KO 8 by Victor Rabanales
Juan Manuel Marquez DQ by Javier Duran

Anymore you would like to add to the list?

[thewinfella]

I think youve nailed that 1 bro !!!!!!!!

[Mr Man]

Interestingly, all the fighters you've mentioned (except for Rafael Marquez) are regarded as legends.

Benny Leonard and Billy Conn also lost their pro debuts.

[Red Ace]

Ricardo Mayorga lost his. Weighed in at 140 to fight a 156 pound olympian. In a 10 round fight. Talk about getting a hard break.

[XviciousX]

Ricardo Mayorga lost his. Weighed in at 140 to fight a 156 pound olympian. In a 10 round fight. Talk about getting a hard break.

LOL same with R. Marquez, he fought a guy with 40+ fights and went 8 rounds on his pro debut.

[JakeNDaBox]

Miguel Canto and Manuel Ortiz also lost their pro debuts.