Saturday, ace Luis Severino struggled again. With an ERA north of eight in his last four starts, the Yankees have to be concerned about him. In the nightcap of a split double header against the Royals, Sabathia tumbled chasing an infield hit, falling on his surgically-repaired right knee. The brace he wears to protect and support the knee got caught in the turf, making the fall look worse than it was, but the fact that he could not get out of the fifth is reason enough to be concerned down the stretch. Masahiro Tanaka, scheduled to start Tuesday night against the Orioles at the Stadium, has been combustible and an injury concern this season. Sonny Gray, who had at least one scout in town to watch his last start, has been solid in three straight starts, but that is not enough for the Yankees to bet their playoff pursuit on.