Why do you people all lack the mental capacity to realize that some event having a few panels doesn't imply that it happened in a short time? You even have various characters point out that Zoro is in a rush and is being stalled, which could be a problem for his crew.
First off it's not one attack, because we can also see Lucci blocking Zoro's swords before that. Secondly, if you mean named attack, we are presented with 2 possibilities:
-they had a normal fight where they both used named attacks like usual;
-Zoro is a 37 IQ retard like his fans and despite being in a rush and needing to settle it quickly he didn't use any decent attack during the whole fight because... well I don't know, I can't really imagine a reason for this.
I think option 1 is far more likely.