In fact, the only other player to have two 20-20 seasons in a career for Boston was Jackie Jensen, who did it in 1954 and '59.
After belting a two-run triple in the second, Betts unloaded for his homer against Athletics lefty Seth Manaea, hitting it a projected distance of 434 feet. That is the longest batted ball for Betts since Statcast™ started in 2015.