Cristiano Ronaldo, 38, became the world’s highest-paid athlete after his move to Saudi Arabian side Al-Nassr nearly doubled his annual playing salary while Paris St Germain duo Lionel Messi (35) and Kylian Mbappe (24) round off the top three, according to Forbes. Ronaldo, who joined the Saudi club on a deal until 2025 after leaving Manchester United last year, earned …