12. Mexican League (Mexico Baseball)

11.Canadian Soccer Association (Canada Soccer)

10. LNBP (Mexico Basketball)

9. Canada Basketball (Canada Basketball)

8.Liga MX (Mexico Soccer)

7. Hockey Canada (Canada Hockey)

6. Canadian Football League (Canada Football)

You might’ve guessed it but all of the Top 5 are from the United States

5.  Major League Soccer (USA Soccer)

4.  National Hockey League (USA Hockey)

3.  Major League Baseball (USA Baseball)

BIG SURPRISE AT #1/2

2.  National Football League (USA Football)

1.  National Basketball Association (USA Basketball

So yeah, NBA is the champion. My guess is the longer season gives NBA the advantage and that the NBA standings change every day, NFL changes every week so you have more people frequently checking in and looking at your site.