Yes, I thought I recognized him via tattoos and blonde hair. It's also confirmed on his wiki, take that for what it's worth. In the previews, it looks like his first fight goes to a decision. I am very pumped for this show!
Every fight end with the two guys standing between an official to call the winner. The guy who he was set to fight had his head down and looked defeated so I assume Joe wins his fight. I also assume he's the last fighter to go on because one guy doesn't get to pick his coach and it makes sense that it would be a vet like Riggs.