Related Clues:

• Something with round parts?
• "Thrilla in Manila," for one
• Mixed martial arts match
• Attack of the flu
• Come to blows
• Contest; illness episode
• Episode of illness, contest
• Fruit he transferred, initially, to box
• Concerned with losing head in fight
• The long one is often taken in the ring
• Harrison has a big one at last!
• Short period of activity
• Struggle; quarrel
• Unconscious immediately after start of boxing match
• Wrestling/boxing match