Saudi Arabia Crown Prince Mohammed bin Salman joined thousands of fans at the Diriyah Arena to see Anthony Joshua beat Andy Ruiz to become a two-time heavyweight champion on Saturday. British boxer Joshua reclaimed the IBF, WBA, WBO and IBO heavyweight titles he had dropped to the Mexican-American in their first meeting six months ago via unanimous decision. Dubbed "Clash on the Dunes", the event on the outskirts of the capital Riyadh was also attended by UFC lightweight champion Khabib Nurmagomedov and four-division boxing champion Saul "Canelo" Alvarez.