Yankees' Aaron Boone: Gary Sanchez 'doing better' but unavailable for Saturday's Red Sox matchupSanchez left Friday's loss with back spasms7/24/2021, 6:41 PMAlex SmithEditorial ProducerJun 8, 2021; Minneapolis, Minnesota, USA; New York Yankees catcher Gary Sanchez (24) hits a single in the sixth inning against the Minnesota Twins at Target Field. / Jesse Johnson-USA TODAY Sports