Let me preface this by saying Gary Sanchez has had an abysmal season. A worst case scenario season, really. He’s been on the disabled list twice, and, when healthy, he’s hit .180/.280/.386 (80 wRC+) in 357 plate appearances. There have been 1,005 individual player seasons of at least 300 plate appearances in Yankees history. Sanchez’s .180 batting average ranks 1,004th. Only someone named Red Kleinow was worse. He hit .168 in 1908.
Sanchez has had a terrible season at the plate and a bad season behind it, particularly blocking the ball, and he is one of the single biggest reasons the Yankees are fighting for home field advantage in the Wild Card Game in the final week of the regular season rather than enjoying a big lead.