The cutoff to crack the world's 100 highest-paid athletes is $25 million this year, compared with $17.3 million five years ago.
Mayweather, who topped the list in 2018 and four times in seven years, only had an exhibition match last December in Japan and did not crack the top 100, which is comprised of athletes from 10 different sports.
Forbes calculates the athletes' earnings by adding up their prize money, salaries and endorsements between June 2018 and June 2019.
Portugal football star Cristiano Ronaldo, who switched from Spanish giants Real Madrid to Italian club Juventus at the start of the northern hemisphere season, is second on $164 million with Brazil's Neymar - who plays for French club Paris St-Germain - listed third with earnings of $158 million.
For the second successive year, Lionel Messi sits above arch-rival Cristiano Ronaldo in Forbes' latest rich list, ranking as the best-earning footballer across the globe.
Adams earned more than the likes of Super Bowl winning quarterback Tom Brady, Liverpool star Mo Salah and National Basketball Association all star centre Nikola Jokic.
Canelo, who defeated Gennady Golovkin last September to become the unified middleweight champion, inked a very lucrative deal last October, signing a five-year 11-fight contract with streaming network DAZN worth $365 million.
Manchester United's Paul Pogba is the highest earning Premier League player in 44th place with $33m (£25.9m).
The top three of the Forbes list is usually reserved for boxers, golfers, tennis players or the NBA's biggest stars.
David Ortiz undergoes more surgery in Boston after shooting
David Ortiz , shown in July 2018, has undergone more surgery at a Boston hospital after being shot in the Dominican Republic. According to ESPN Deportes, police have the suspected gunman and the suspected driver of the motorcycle in custody.
Amit Shah chairs meeting on Cyclone Vayu
IMD said, " Cyclone Vayu is likely to cross the Gujarat coast between Porbandar and Mahuva around the Veeraval and Diu region". The monsoon was anyway expected to be delayed by a week due to its late arrival in Kerala, said another official.
USWNT wins most lopsided game in World Cup history
Alex Morgan scored a record-tying five goals and 21-year-old Mallory Pugh scored off of the bench in her Women's World Cup debut. There was no other way to describe the US defeating Thailand on Tuesday night to kick off their Women's World Cup title defense.