Which players fueled the epic rivalry between the Lakers and Celtics? Who’s the better quarterback, Tom Brady or Eli Manning? Which is the better baseball team, Red Sox or Yankees? Who’s the world’s biggest soccer star, Messi or Ronaldo? Rivalries fuel competition on and off the field. How did these rivalries begin? What are some of the most memorable matchups? And what do the stats say about who really comes out on top? This new high-interest Sports Illustrated Kids series takes readers behind the scenes to find out.