He was mourned globally, and a family spokesman said the family "certainly believes that Muhammad was a citizen of the world ... and they know that the world grieves with him." Politicians such as Barack Obama, Hillary Clinton, Bill Clinton, Donald Trump, David Cameron and more paid tribute to Ali. Ali also received numerous tributes from the world of sports including Michael Jordan, Tiger Woods, Floyd Mayweather, Mike Tyson, the Miami Marlins, LeBron James, Steph Curry and more. Louisville Mayor Greg Fischer stated, "Muhammad Ali belongs to the world. But he only has one hometown."
In 2008, Stallone endorsed John McCain for that year's presidential election. In the 2016 election he described Donald Trump as a "Dickensian character" and "larger than life," but did not endorse him or any candidate in that year's Republican primary.
Sylvester Stallone formed a film studio with Braden Aftergood in March 2018, named Balboa Productions, where Stallone will serve as co-producer for each of their projects. The studio signed a multi-year collaboration deal with Starlight Culture Entertainment to develop projects for film and television. Following the releases of Creed II, Rambo V: Last Blood, and The Expendables 4, the studio has an extensive production slate. A film depicting the history of Jack "Galveston Giant" Johnson, the first African-American boxing heavyweight champion is in development. The project was announced after Stallone's instrumental involvement in helping get Johnson a posthumous pardon from US President Donald J. Trump.
In 2015, Tyson announced that he was supporting Donald Trump's presidential candidacy.
On June 12, 2011, Tyson was inducted to the International Boxing Hall of Fame alongside legendary Mexican champion Julio César Chávez, light welterweight champion Kostya Tszyu, and actor/screenwriter Sylvester Stallone.
In 1992, Tyson was convicted of rape and sentenced to six years in prison, but was released on parole after serving three years. After his release in 1995, he engaged in a series of comeback fights. He won the WBC and WBA titles in 1996, after stopping Frank Bruno and Bruce Seldon. With his defeat of Bruno, Tyson joined Floyd Patterson, Muhammad Ali, Tim Witherspoon, Evander Holyfield, and George Foreman as the only men in boxing history to have regained a heavyweight championship after having lost it. After being stripped of the WBC title in the same year, Tyson lost the WBA title to Evander Holyfield by an eleventh round stoppage. Their 1997 rematch ended when Tyson was disqualified for biting Holyfield's ears.
In winning this fight at the age of 22, Clay became the youngest boxer to take the title from a reigning heavyweight champion. However, Floyd Patterson remained the youngest to win the heavyweight championship, doing so at the age 21 during an elimination bout following Rocky Marciano's retirement. Mike Tyson broke both records in 1986 when he defeated Trevor Berbick to win the heavyweight title at age 20.
Stallone gained worldwide fame with his starring role in the smash hit Rocky (1976). On March 24, 1975, Stallone saw the Muhammad Ali–Chuck Wepner fight. That night Stallone went home, and after three days and 20 straight hours, he had written the script, but Stallone subsequently denied that Wepner provided any inspiration for it. Other possible inspirations for the film may have included Rocky Graziano's autobiography Somebody Up There Likes Me, and the movie of the same name. Wepner filed a lawsuit which was eventually settled with Stallone for an undisclosed amount. Stallone attempted to sell the script to multiple studios, with the intention of playing the lead role himself. Irwin Winkler and Robert Chartoff became interested and offered Stallone US$350,000 for the rights, but had their own casting ideas for the lead role, including Robert Redford and Burt Reynolds. Stallone refused to sell unless he played the lead character and eventually, after a substantial budget cut to compromise, it was agreed he could be the star.
The fight took place on October 2, 1980, in Las Vegas Valley, with Holmes easily dominating Ali, who was weakened from thyroid medication he had taken to lose weight. Giachetti called the fight "awful ... the worst sports event I ever had to cover." Actor Sylvester Stallone was at ringside and said that it was like watching an autopsy on a man who is still alive. In the eleventh round, Angelo Dundee told the referee to stop the fight, making it the only time that Ali ever lost by stoppage. The Holmes fight is said to have contributed to Ali's Parkinson's syndrome. Despite pleas to definitively retire, Ali fought one last time on December 11, 1981, in Nassau, Bahamas, against Trevor Berbick, losing a ten-round decision.