In 1966, with only 22 months of training, Lewis won the grand championship of the first tournament he entered, the U.S. Nationals, promoted by
Jhoon Rhee. Lewis defeated seven opponents before defeating
Thomas Carroll by a 2–0 decision. Lewis reigned as the U.S. Nationals grand champion from 1966 to 1969. At the 1967 Nationals in Washington, Lewis won the championship by defeating
Mitchell Bobrow in the semi-final and beating Frank Hargrove 3–2 in the finals. Previously, Lewis defeated Hargrove in New York City at '
Henry Cho's Karate Tournament'. In 1966, at the Long Beach Internationals, Lewis lost an upset decision to
Allen Steen. In 1967, Lewis defeated Chuck Norris's brother Wieland Norris, Steve LaBounty, and Frank Knoll, as well as Frank Hargrove for the third time. In August 1968, Lewis was defeated by
Victor Moore at the World's Hemisphere Karate Championships, the second professional karate tournament in history, which took place in
San Antonio, Texas and was promoted by
Robert Trias and Atlee Chittim. Moore and Lewis split the championship purse of $1,000. The same year, Lewis defeated Louis Delgado, who had beaten Chuck Norris the year before. On November 24, 1968, at the
Waldorf Astoria Hotel in New York City, Lewis won Aaron Banks' World Professional Karate Championships by defeating Victor Moore to win the World Heavyweight Title, and was paid $600. In 1970, Lewis lost in an upset to John Natividad at the All-Star Team Championships in
Long Beach, California. At the 'Battle of Atlanta', which was promoted by
Joe Corley, Joe Lewis defeated
Mitchell Bobrow in a closely contested come-from-behind victory for the Heavyweight Championship, and Joe Hayes for the Grand Championship. At
Ed Parker's 1972 'International Karate Championships',
Darnell Garcia scored an upset victory over Lewis. That same year, at the 1972 Grande Nationals in Memphis Tennessee, Joe Lewis beat Jerry Piddington and won his grande title match in a 1–0 victory. 1974 marked Lewis' final year in tournament karate competition. In May, he lost to Charles Curry in New York at the Hidy Ochiai National Karate Tournament. That same month, Lewis won the PAWAK tournament, which lasted from May 11 to May 12. Lewis scored victories over Frank Harvey, Smiley Urquidez,
Benny Urquidez, and Cecil Peoples in the elimination matches, and won the championship with a 4–3 points decision over Steve Sanders. Finally, at Mike Anderson's, 'Top 10 National Professional Karate Tournament', Lewis lost to Everett "Monster Man" Eddy in the finals. In 1983, Lewis was voted by top fighters and promoters as the greatest karate fighter of all time, Lewis was a veteran of the
Vietnam War, where he served in the communications field. His military decorations include
Marine Corps Good Conduct Medal,
National Defense Service Medal,
Armed Forces Expeditionary Medal, and "Expert" Rifle Badge. He acted in films and on TV, and was briefly married to actress
Barbara Leigh. Throughout his life, he continued to give seminars and work in the entertainment industry. ==Kickboxing and full-contact karate career==