Sanji vs Kizaru (Both kickers who rely on speed, Sanji has strong observation Haki) this is the obvious one
Zoro vs Fujitora (Zoro always tends to fight honorable battles and genereally has respect for his opponent and otherwise, Fujitora fits in this regard 100%. They also foreshadowed their fight in Dressrosa and Stampede. People get too caught up with Greenbulls sword, Kizaru also uses a sword, Queen also had a sword, doesn't mean much.
Yamato vs Greenbull ( They will start beefing next chapter once Greenbull crashes the party, Ice usually is also a good counter against plants Pokemon FTW)