What is the biggest baseball rivalry?

Answer 1

Although its not as glamorous as the Red Sox - Yankees rivalry, the biggest and longest standing rivalry in Baseball is the Giants-Dodgers rivalry, which started in the mid-nineteenth century in New York.

I have to respectfully disagree.

Ken Fougere's Opinion:

THE rivalry began over 100 years ago. Ever since, it has taken on a life of its own! It starts with the owners, the front office, the coaching staff, the players, right down to the their fans, (past & present). Unlike some other rivalries, these two teams have never re-located, to, or from another city since their inception into the league. With the exception of numbers being added to the jersey's back, their basic team uniforms have remained the same since before the Titanic sunk!

I feel no other rivalry can match this historic, Boston Red Sox - New York Yankee rivalry.

Especially when in 2004, the Red Sox made MLB playoff history as the first team ever to comeback from a 0-3 games deficit to win the American League Championship Series. Oh, BTW, their opponent was the New York Yankees. That historic comeback enabled them to go on to win their first World Series in 86 years by sweeping the Cardinals. The Red Sox followed up their 2004 Championship with World Series titles in 2007 and 2013.

To me, this rivalry is not only the best in MLB, but in all American pro sports.