Conversation so far:
Who did Jim Duggan beat to win the Royal Rumble?
King Harley Race
Where did the Royal Rumble take place with Jim Duggan?
Hamilton, Ontario
Did Jim Duggan do anything notable during the Royal RUmble fight besides win?
He won the match after he last eliminated the One Man Gang.
How did Honky Tonk get himself disqualified?
What did Jim Duggan do after winning the Royal Rumble title?
At WrestleMania IV, he participated in a 14-man tournament for the vacant WWF World Heavyweight Championship.

Question: Did anyone else challenge the title?
Self-contained rewrite: Did anyone else challenge Jim Duggan for the title?