Former undisputed cruiserweight world champion Oleksandr Usyk views Anthony Joshua as a much tougher fight than Andy Ruiz.
Last year, Usyk unified the entire cruiserweight division, and then announced a move to heavyweight a few months later.
He was scheduled to debut at heavyweight back in May, but the fight was pushed back after Usyk suffered an injury in training camp.
Usyk had Joshua as his dream opponent - but that plan came crashing down last month, when Ruiz pulled off a massive upset by stopping Joshua in seven rounds to capture the IBF, IBO, WBA, WBO heavyweight titles.
A rematch is going to take place - and Usyk is crossing his fingers that Joshua comes out on top.
He hopes to one day face Joshua in a huge stadium fight.
"[I want] Anthony Joshua at Wembley," answered Usyk to Sky Sports. "I think it would be much harder for me to fight Joshua than Ruiz.
"I was asked the question 'whom would I like to fight' and of course I named the three best heavyweights today in the division [Joshua, Deontay Wilder, Tyson Fury]. If you want to be the best, you have to fight the best and these guys today are the best ones. If I'm going to be fighting just the regular guys, I'm just going to be a regular guy on the line, I want to be on top of it."
According to Usyk, his canceled fight with Carlos Takam is being rescheduled for the fall.
"I am also very much waiting for the bout. I am already tired not to fight, just to train and train. I am ready for the hard work, I'm ready to prepare for the fight and I'm looking forward to my debut as a heavyweight," Usyk said.
"Yesterday we had a meeting with Eddie Hearn and we talked about that, so it looks like it's going to be in September but most likely in October. We're talking about the United States. We don't know 100 percent yet but Eddie was saying it would most likely be Takam."