Amateur Results | 1959 | Date | Opponent | Place | Result | - Feb. 7 | Ralph Loeschner | Grand Rapids, Michigan | LPTS 3 | | | 1960-1961 No activity recorded | | 1962 | Date | Opponent | Place | Result | |
Grand Rapids, Michigan, Western Michigan Golden Gloves Heavyweight Novice winner | + Feb. 7 | Claude Cooper | Grand Rapids, Michigan | WPTS 3 | + Feb. 10 | Fred Van Noller | Grand Rapids, Michigan | WKO 1 | + Feb. 10 | John Ficeli | Grand Rapids, Michigan | WTKO 1 | |
Grand Rapids, Michigan, Michigan State Golden Gloves Heavyweight Novice winner | + Feb. 17 | Askold Smits | Grand Rapids, Michigan | WTKO 3 | + Feb. 17 | Bobby Evans | Grand Rapids, Michigan | WKO 1 | |
Chicago, Illinois, Tournament of Champions Heavyweight 2nd place | + Feb. 27 | Ivory Beau | Chicago, Illinois | WPTS 3 | + Feb. 28 | Charles Singleton | Chicago, Illinois | WPTS 3 | + Mar. 7 | James J. Beattie (USA) | Chicago, Illinois | WPTS 3 | - Mar. 7 | Bennie Black | Chicago, Illinois | LPTS 3 | | | 1963 No results recorded | | 1964 | Date | Opponent | Place | Result | |
Grand Rapids, Michigan, Western Michigan Golden Gloves Heavyweight winner | + Feb. 5 | Fred Scott | Grand Rapids, Michigan | WTKO 2 | + Feb. 8 | Paul Kowalczyk | Grand Rapids, Michigan | WTKO 1 | |
Grand Rapids, Michigan, Michigan State Golden Gloves Heavyweight 2nd place | - Feb. 15 | Wilbert Elbert | Grand Rapids, Michigan | LPTS 3 | Mathis, in loss to Elbert, twisted his knee in the first round and was severly hampered afterwards | |
Grand Rapids, Michigan, Michigan State AAU Heavyweight winner | + Mar. 24 | William Williamson | Grand Rapids, Michigan | WPTS 3 | |
Las Vegas, Nevada, United States National Championships Heavyweight winner | + Apr. 8 | Gene Hamilton | Las Vegas, Nevada | WPTS 3 | + Apr. 9 | Wes Walker | Las Vegas, Nevada | WPTS 3 | + Apr. 10 | Jim Hall | Las Vegas, Nevada | WPTS 3 | + Apr. 10 | Al Wilson | Las Vegas, Nevada | WPTS 3 | |
Flushing, New York, US Olympic Trials Heavyweight winner | + May 18 | Richard Pettigrew | Flushing, New York | WPTS 3 | + May 19 | Tyrone Hollins | Flushing, New York | WPTS 3 | + May 20 | Joe Frazier (USA) | Flushing, New York | WPTS 3 | |
Detroit, Michigan, Olympic Fund bouts | + Aug. 5 | William Williamson | Detroit, Michigan | WTKO 3 | Fight scheduled as an exhibition | + Sept. 5 | Mike Mercredi | Toronto, Canada | WTKO 1 | |
Hamilton AF Base, California, US Olympic Elimination Bouts Heavyweight winner | + Sept. 18 | Joe Frazier (USA) | Hamilton AF Base, California | WPTS 3 | Mathis, in second victory over Frazier, broke his right middle finger and was removed from the U.S. Olympic team |
Professional record | 1965 | Date | Opponent | Place | Result | + June 28 | Bob Maynard | Montreal, Canada | TKO 2 | + Aug. 28 | Johnny Shore | Rock Island, Canada | TKO 2 | + Aug. 30 | Gerald Couturier | Montreal, Canada | W 4 | + Sept. 23 | Bob Stallings | Grand Rapids, USA | W 6 | + Dec. 15 | Charlie Lee | White Plains, USA | W 6 | | 1966 | Date | Opponent | Place | Result | + Jan. 7 | Chuck Wepner | New York, USA | TKO 3 | + Jan. 19 | Mike Bruce | White Plains, USA | KO 5 | + Feb. 16 | Charley Polite | White Plains, USA | W 6 | + June 16 | Tom Swift | Portland, USA | KO 1 | + June 23 | Everett Copeland | New York, USA | KO 2 | + July 28 | Charley Chase | Portland, USA | W 6 | + Aug. 29 | Mert Brownfield | Detroit, USA | KO 1 | + Sept. 15 | Bob Stallings | Akron, USA | W 10 | + Sept. 28 | Earl Averette | Johnstown, USA | KO 3 | + Nov. 2 | Johnny Barrazza | Grand Rapids, USA | KO 1 | + Nov. 17 | Ed Sonny Andrews | Portland, USA | KO 2 | | 1967 | Date | Opponent | Place | Result | + Feb. 6 | Waban Thomas | Houston, USA | KO 1 | + May 12 | Ed Hurley | Detroit, USA | KO 1 | + May 23 | Sonny Moore | Saint Louis, USA | TKO 5 | + Aug. 2 | Wayne Heath | Los Angeles, USA | KO 5 | + Sept. 18 | Ron Marsh | New York, USA | TKO 4 | + Nov. 18 | Roberto Davila | Stockholm, Sweden | TKO 7 | + Dec. 26 | Gerry de Bruyn | Gothenburg, Sweden | KO 1 | | 1968 | Date | Opponent | Place | Result | - Mar. 4 | Joe Frazier | New York, USA | TKO by 11 | (For vacant NYSAC World Heavyweight Title) | + Apr. 30 | Mel Turnbow | Miami Beach, USA | TKO 7 | + July 25 | James J. Beattie | Bloomington, USA | TKO 7 | + Sept. 5 | Amos Lincoln | Los Angeles, USA | W 10 | + Sept. 16 | Dick Wipperman | Milwaukee, USA | W 10 | + Sept. 26 | James J Woody | New York, USA | TKO 6 | | 1969 | Date | Opponent | Place | Result | + Feb. 3 | George Chuvalo | New York, USA | W 12 | - Mar. 24 | Jerry Quarry | New York, USA | L 12 | | | 1970 Inactive | | 1971 | Date | Opponent | Place | Result | - Nov. 17 | Muhammad Ali | Houston, USA | L 12 | (For NABF Heavyweight Title) | | 1972 | Date | Opponent | Place | Result | + Sept. 5 | Humphrey McBride | Oklahoma City, USA | TKO 3 | - Sept. 29 | Ron Lyle | Denver, USA | KO by 2 |
Summary
Total bouts: 34, Won: 30 (21 inside the limit), Lost: 4 (2 inside the limit), Draw: 0, NC: 0, ND: 0
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