The pair have constantly featured high up on Forbes' annual list of the highest-paid athletes in the world, thanks to their astronomical wages and various endorsements.
In fact, since Forbes has been tracking the leading earners in sport, Ronaldo and Messi are the only footballers to ever top the list.
The Argentine was named the world's highest-paid athlete in 2019 for the first time.
Football actually dominated the entire top three, with Paris Saint-Germain star Neymar landing third spot.
Take a look at the top ten highest-paid sports stars of 2019 and their respective earnings below…
10. Kevin Durant - $65.4m
9. Stephen Curry - $79.8m
8. LeBron James - $89m
7. Aaron Rodgers - $89.3m
6. Russell Wilson - $89.5m
5. Roger Federer - $93.4m
4. Canelo Alvarez - $94m
3. Neymar - $105m
2. Cristiano Ronaldo - $109m
1. Lionel Messi - $127m
Cristiano Ronaldo and Lionel Messi have been battling to be crowned the world's best footballer for more than a decade - but they've also been locking horns off the pitch.
Monaco 
Stade Brestois 29 
Bordeaux 
Nimes 
Bayern Munich 
FC Augsburg 
Paris Saint Germain 
Toulouse 
CSKA Moscow 
FC Rostov 
Leicester 
Chelsea 
Valencia 
Betis 
Dynamo Kyiv 
Chornomorets Odesa 
Verona 
Inter 
Bayer Leverkusen 
FC Heidenheim 
Borussia Dortmund 
SC Freiburg 
VFL Wolfsburg 
Union Berlin 
Arsenal 
Nottingham Forest 
Everton 
Brentford 
Spartak Moscow 
Lokomotiv Moscow 
Rangers 
Dundee Utd 
Atletico Madrid 
Alaves 
Lens 
Marseille 
Ingulets Petrove 
Shakhtar Donetsk 
AC Milan 
Juventus 
ST Malo 
Manchester City 
Tottenham 
Eintracht Frankfurt 
Werder Bremen 
Girona 
Espanyol 
Feyenoord 
Heerenveen 
ST Etienne 
Montpellier 
Grenoble Foot 38 
Heart Of Midlothian 
Celtic 
Reims 
Lyon 
PSV 
Groningen