"There has never been a better time to own a top-notch pro sports franchise," Forbes Media Senior Editor Kurt Badenhausen said.
"Blockbuster TV contracts and owner-friendly collective bargaining agreements are fuelling record sale prices across major sports leagues."
Here's Forbes' full list of the world's 50 most valuable sports teams of 2018:
Rank, Team, Value (US$), 1-Yr change (Sport)
1. Dallas Cowboys, $4.8 billion, 14% (NFL)
2. Manchester United, $4.123 billion, 12% (Soccer)
3. Real Madrid, $4.09 billion, 14% (Soccer)
4. Barcelona, $4.064 billion, 12% (Soccer)
5. New York Yankees, $4 billion, 8% (MLB)
6. New England Patriots, $3.7 billion, 9% (NFL)
7. New York Knicks, $3.6 billion, 9% (NBA)
8. Los Angeles Lakers, $3.3 billion, 10% (NBA)
8. New York Giants, $3.3 billion, 6% (NFL)
10. Golden State Warriors, $3.1 billion, 19% (NBA)
10. Washington Redskins, $3.1 billion, 5% (NFL)
12. Bayern Munich, $3.063 billion, 13% (Soccer)
13. San Francisco 49ers, $3.05 billion, 2% (NFL)
14. Los Angeles Dodgers, $3 billion, 9% (MLB)
15. Los Angeles Rams, $3 billion, 3% (NFL)
16. Chicago Cubs, $2.9 billion, 8% (MLB)
17. San Francisco Giants, $2.85 billion, 8% (MLB)
18. Chicago Bears, $2.85 billion, 6% (NFL)
19. Boston Red Sox, $2.8 billion, 4% (MLB)
20. Houston Texans, $2.8 billion, 8% (NFL)
21. New York Jets, $2.75 billion, 0% (NFL)
22. Philadelphia Eagles, $2.65 billion, 6% (NFL)
23. Chicago Bulls, $2.6 billion, 4% (NBA)
23. Denver Broncos, $2.6 billion, 8% (NFL)
25. Miami Dolphins, $2.575 billion, 8% (NFL)
26. Green Bay Packers, $2.55 billion, 9% (NFL)
27. Boston Celtics, $2.5 billion, 14% (NBA)
28. Baltimore Ravens, $2.5 billion, 9% (NFL)
29. Atlanta Falcons, $2.475 billion, 16% (NFL)
30. Manchester City, $2.474 billion, 19% (Soccer)
31. Pittsburgh Steelers, $2.45 billion, 9% (NFL)
32. Seattle Seahawks, $2.425 billion, 9% (NFL)
33. Minnesota Vikings, $2.4 billion, 9% (NFL)
34. Oakland Raiders, $2.38 billion, 13% (NFL)
35. Indianapolis Colts, $2.375 billion, 9% (NFL)
36. Brooklyn Nets, $2.3 billion, 28% (NBA)
37. Carolina Panthers, $2.3 billion, 11% (NFL)
38. Los Angeles Chargers, $2.275 billion, 9% (NFL)
39. Arsenal, $2.238 billion, 16% (Soccer)
40. Houston Rockets, $2.2 billion, 33% (NBA)
41. Los Angeles Clippers, $2.15 billion, 7% (NBA)
42. Arizona Cardinals, $2.15 billion, 6% (NFL)
43. New York Mets, $2.1 billion, 5% (MLB)
44. Kansas City Chiefs, $2.1 billion, 12% (NFL)
45. Jacksonville Jaguars, $2.075 billion, 6% (NFL)
46. Chelsea, $2.062 billion, 12% (Soccer)
47. Tennessee Titans, $2.05 billion, 2% (NFL)
48. New Orleans Saints, $2 billion, 14% (NFL)
49. Tampa Bay Buccaneers, $1.975 billion, 10% (NFL)
50. Cleveland Browns, $1.95 billion, 5% (NFL)