The arrival of 2020 ushers in a new decade, which means it's the perfect time to look back at the past 10 years and highlight some of baseball's most unforgettable moments.

There will be retirements, brawls, walk-offs, statistical milestones and, of course, World Series heroics.

In narrowing our list down to 10, we've inevitably omitted a lot of amazing stuff. But these moments will inarguably live forever in MLB history.

The Perfect Games

OK, we're cheating a little here, but a perfect game is a perfect game. Like a snowflake, each one is unique and beautiful in its own way.