Two generations will collide as Wladimir Klitschko faces what might have been the biggest challenge of his career in Anthony Joshua. 90,000 people will be in attendance as Klitschko tries to regain the Heavyweight title on the April 29 Klitschko vs Joshua bout at Wembley Stadium in London.

In an interview with talksport, Wladimir Klitschko admitted that the bout with current IBF Heavyweight champion Anthony Joshua will be the toughest challenge he ever had. The 40-year-old former heavyweight champion also said that the 27-year-old Briton is a copy of him in certain ways.

Klitschko lost his WBO heavyweight belt in a rare defeat against Tyson Fury back on October 24, 2015. Former heavyweight champion Lennox Lewis believe that the British champion will remain undefeated and win the April 29 Klitschko vs Joshua boxing match.

Speaking with BBC, Lewis said that the Fury loss may have caused a notch on Klitschko's armor. The former heavyweight champion also believe that Klitschko would have retained his heavyweight belt during the Fury bout if the Ukrainian heeded the instructions of his trainer, Johnathon Banks.

Klitschko on his part believe that the Klitschko vs Joshua boxing main event will be an upgrade in his boxing career. Klitschko has headlined some sold out boxing bouts before but none as big as the 90,000 capacity of the Wembley Stadium.

In January 2017, Eddie Hearn, who promotes Joshua, announced that 80,000 tickets have already been sold for the Klitschko vs Joshua boxing match. The record-breaking tickets sale matched the Froch vs Groves II that was also held at Wembley. The Klitschko vs Joshua bout is expected to eclipse the previous record.

Both the IBF and WBA heavyweight title will be on the line in the Wladimir Klitschko vs Anthony Joshua bout. Joshua is the current IBF heavyweight title. The winner of the Klitschko vs Joshua boxing match will have to face mandatory challenger Luis Ortiz for the WBA belt next.