Opponent is related to Competition. Arena can be used for Competition. Arena can be used for Fight. 
Franchise is related to Branch. Branch is a synonym of Part. Part is related to Knee. 
Opponent <--RelatedTo--> Competition <--UsedFor-- Arena --UsedFor--> Fight 
Franchise <--RelatedTo--> Branch <--Synonym--> Part <--RelatedTo--> Knee 