By Brian Hoops, WrestlingObserver.com
1925 - Joe Stecher defeated Stanislaus Zbyszko for the World's Heavyweight Wrestling Title in St. Louis, Missouri.
1943 - Joe Silva defeated Adolfo Bonales to win the Mexico National Lightweight Title in Mexico City, Mexico.
1945 - Marshall Estep defeated Ken Fenelon for the NWA World Junior Heavyweight Title in Toronto, Iowa.
1956 - Killer Kowalski defeated Yvon Robert in Montreal, Quebec for the Montreal World Heavyweight Title
1963 - In Amarillo, TX at the Sports Arena; AWA Champion Verne Gagne drew with Amarillo World Champion Dory Funk Jr when the 60 minute time limit expired in the 3rd fall. Also on the card, Tokyo Tom beat Dory Funk Sr in 2 out of 3 falls after Sputnik Monroe interfered and Bob Ellis & Wahoo McDaniel & Ricky Romero beat Killer Karl Kox & Mike DiBiase & Sputnik Monroe; In Kansas City; Kansas; In a Lumberjack match, Masked Medic #1 and Masked Medic #2 beat Steve Bolus and Steve Kovacs, Bob Geigel beat Sonny Myers, Larry Hamilton beat Roy Collins and Joe Scarpello beat Rock Hunter via dq.
1964 - Bobby Steele defeated Chick Purvey to win the European Middleweight Title in Manchester, England; Benny Galant defeated El Rayo de Jalisco to win the NWA World Middleweight Title in Mexico City, Mexico.
1966 - Herb Welch and Al Costello defeated Karl and Eric von Brauner in a tournament final to win the vacant Mid-America version of the NWA World Tag Team Title in Memphis, Tennessee.
1970 - In Minneapolis, MN; AWA Champion Verne Gagne beat Dr. X on a reverse decision 3rd fall dq and Blackjack Lanza & Lars Anderson beat Red Bastien & Pepper Gomez; Bobby Hart defeated Johnny Valentine for the NWA Southern Junior Heavyweight Title in Memphis, Tennessee.
1973 - Tony Garea & Haystacks Calhoun defeated Professor Tanaka & Mr. Fuji for the WWWF World Tag Team Title in Hamburg, Pennsylvania.
1974 - In Kansas City; KS; The Interns (w/ Dr. Ken Ramey) defeated Omar Atlas & The Viking, Bob Geigel & Rufus R. Jones defeated Bob Brown & Lord Alfred Hayes and Don Fargo defeated Mike George.
1978 - Antonio Inoki defeated Andre the Giant by countout in Osaka, Japan to win the first-annual New Japan Pro Wrestling MSG League.
1980 - In Denver, CO; The Crusher beat AWA Champion Nick Bockwinkel in a non Title Cage Match, also Adrian Adonis & Jesse Ventura beat Greg Gagne & Wahoo McDaniel and Jerry Blackwell went to a no contest with Dino Bravo.
1981 - Jack Brisco defeated Kim Song for the WWC Caribbean Heavyweight Title in San Juan, Puerto Rico; Sweet Ebony Diamond defeated Greg Valentine to win the NWA Television Title in Charlotte, North Carolina
1983 - Little Tokyo defeated Cowboy Lang in Vancouver, British Columbia, for the NWA World Midgets Title
1984 - Angelo Mosca defeated Mike Rotundo to win the Florida version of the NWA Southern Heavyweight Title in Tampa, Florida.
1986 - A tournament was held to crown the first ever Universal Wrestling Federation Champion in Houston, Texas. The UWF was the new name for Bill Watts' Mid-South Wrestling. Prior to the tournament, Hacksaw Duggan, the reigning Mid-South North American Champion, vacated his title. Terry Gordy defeated Hacksaw Duggan to win the title; The Shadow (Jaymie Knight) won a 13-man battle royal to win the vacant NWA Central States Heavyweight Title in Des Moines, Iowa; In Oakland, California; Jerry Blackwell won a battle royal, Nick Bockwinkel beat Larry Zbyszko, in a non title match; Midnight Rockers beat AWA TagTeam Champions Buddy Rose & Doug Somers. Attendance was estimated at 1,500.
1996 - Sean Morley (Val Venis) defeated El Bronco for the WWC Television Title in Caguas, Puerto Rico.
1998 - Hysteria defeated Vance Nevada to win the Canadian Wrestling Federation Junior Heavyweight Title.
2000 - In Nampa, Idaho, in a match taped for the May 31 edition of WCW Thunder, Sean Stasiak and Chuck Palumbo defeated Kronik (Brian Adams and Brian Clark) for the WCW World Tag Team Title.
2001 - Evolution (Nova and Frankie Kazarian) won a tournament for the vacant UPW Tag Team Title in Santa Ana, California