MLB playoffs 2021 - Power Rankings and key storylines for the final four teams

The 2021 MLB playoffs are down to the final four.

The Boston Red Sox battle the Houston Astros in the American League Championship Series, while the Atlanta Braves meet the Los Angeles Dodgers in the National League Championship Series.

So who has the edge?

Alden Gonzalez breaks down each team's strengths, weaknesses and keys to winning a pennant, while David Schoenfield takes a closer look at the storylines to watch with a trip to the World Series hanging in the balance.