As of 2020, Wladimir Klitschko holds record of most boxers beaten for the world heavyweight title, with 23. Klitschko holds the record for the longest cumulative heavyweight title reign of all time, with 4,382 days as world heavyweight champion. Joe Louis has won the most world heavyweight title bouts, with 27. Louis holds the record for most consecutive title defenses at this division, with 26 defenses of the world title. This is also the record for most consecutive title defenses in boxing history. Evander Holyfield, Michael Moorer, Lennox Lewis, Vitali Klitschko and Ruslan Chagaev have held various versions of the title belts on three occasions. Four boxers have regained the heavyweight title in an immediate rematch: Floyd Patterson in 1960, Muhammad Ali in 1978, Lennox Lewis in 2001, and Anthony Joshua in 2019. Mike Tyson holds the record for being the youngest heavyweight to ever have achieve championship status, becoming champion at the age of 20. Tyson also became the first heavyweight to own all three major belts – WBA, WBC, and IBF as well as The Ring and lineal heavyweight titles at the same time.