Bob Arum says that should WBO welterweight champion, Terence Crawford defeat Amir Khan on April 20, that he will make efforts to make a bout with IBF titlist, Errol Spence, ''On Monday morning I will call Mr. (Al) Haymon and say, 'It's time to make this fight,''' said Arum, who believes it's an ''easy fight'' to make given the template that was set with the Floyd Mayweather-Manny Pacquiao fight, which was a shared pay-per-view broadcast with competing networks, involved.