Earning vast sums from sell-out football stadium bouts and the clout of Sky Sports Box Office in the UK, Joshua recently pocketed £18m ($25m) from his latest title defense against Joseph Parker.
The current four-belt heavyweight ruler is expected to stay at the helm for some time to come, having recently been offered $50m by Deontay Wilder for a massive undisputed unification.
Recent bad news gets worse for Canelo Alvarez as the Mexican drops from first to third on the list, compounding his misery after missing out on a lucrative rematch with Gennady Golovkin.
Here’s how the Forbes list looks:
1.Anthony Joshua (Up from 2nd)
2. Gennady Golovkin (Up from 3rd)
3. Canelo Alvarez (Down from 1st)
4. Vasiliy Lomachenko (Non-mover)
5. Deontay Wilder (Up from 7th)
6. Errol Spence (Down from 5th)
7. Terence Crawford (Down from 6th)
8. Sergey Kovalev (Non-mover)
9. Daniel Jacobs (Non-mover)
10. Mikey Garcia (Non-mover)
11. Jermall Charlo (Up from 14th)
12. Jermell Charlo (Up from 13th)
13. Adrien Broner (New entry)
14. Srisaket Sor Rungvisai (Down from 11th)
15. Keith Thurman (Down from 12th)
Joshua is expected to announce his US debut in 2018 alongside the might of Showtime Pay-Per-View, which will only cement his place at the top further for many years to come.
Canelo, who is suspended until August, faces a huge fight to claw back the position he took when Floyd Mayweather retired from the sport.
1. Canelo Alvarez
2. Anthony Joshua
3. Gennady Golovkin
4. Vasyl Lomachenko
5. Errol Spence
6. Terence Crawford
7. Deontay Wilder
8. Sergey Kovalev
9. Daniel Jacobs
10. Mikey Garcia
11. Srisaket Sor Rungvisai
12. Keith Thurman
13. Jermell Charlo
14. Jermall Charlo
15. Manny Pacquaio