We didn't actually see any fights. We only saw them charge at one another. Don't get me wrong, there is a good chance of them being swordsman considering Oda decided to give them swords, but for now I don't wanna go that route.
The thing is we don't know if Roger and Xebec had any DF. For now, most of the swordsmen don't have DF (except Law, Cracker and Shiryu, but Law is pathetic in swordfights). So, too soon to make judgments.