The 2021 season was an absolutely wild one for the Boston Red Sox, with some almost literally unbelievable highs and crushing lows. The second half had more of the bad than the first, so it can be easy to forget just how wild this team was for so much of the season, and how seemingly every game was a thrill ride, often ending with a win. Today, we’re going to look back at the biggest plays of the season in terms of win probability added on the play. WPA data comes from Baseball-Reference’s Stathead tool.