This is also one of the biggest and oldest rivalries in sports. For huge parts of the 86 year drought, it was pretty one-sided, but, with the arrival of John Henry, its definitely two-sided. Indeed, with JH at the helm for 19 years, the Sox have 4 titles to the Yankees 1.
This year was supposed to be a rebuilding year for the Sox, with Chaim Bloom tasked with building a competitive team without necessarily simply buying one as DD did. I'm anti-Dombrowski, but that doesn't keep me from enjoying the arguments in his defense. The 2018 Sox, for which DD gets a lot of credit, were the best Sox team in their 121 year history.
This season has been ridiculously improbable. The Sox lost their first three to the moribund Orioles, foretelling an epically terrible season. But the 9 game winning streak allowed the Sox to charge to the front and hold on to the AL East lead into July. Then came the July and August losing streaks and the Rays re-establishing themselves as the best team in the AL East, as well as the AL, just as they were last year.
The Yankees, expected to be solid this year, were anything but and sank in the standings to 3d and even 4th in the AL East. Then came the August 1 Yankees, followed by a 13 game winning streak to overtake the Sox, followed by a sagging September, and--surprise, surprise--a 7 game winning streak by the Sox.
Neither team is likely to catch the Rays and both are reduced to scrambling for one of two wild card slots while fighting off the Jays, Mariners, and even the A's.
Plus, getting to and even winning the wild card game means facing the Rays, the best team in the AL.
Still, just as splendidsplitter says, this is a huge series--in autumn, yet. Ain't it grand?