Saturn vs Luffy
Zoro vs kizaru
But problem is Saturn isn't going down so soon. Don't think oda will make a Gorosei lose (such big character) in his intro arc and that too right after Luffy defeated Kaido.
This imply only two things - either kizaru will go down to luffy or there will be just small clash between kizaru and zoro (if we get optimistic)
I really don't have higher expectations anymore. As long as Luffy is there, no one else is beating top gun in an arc no matter how good of a match it could be