BOSTON — It can always get worse.

After Saturday’s washout followed Friday’s stinker, the Yankees’ miserable weekend at Fenway Park sank even lower on Sunday when they were swept out of town.

The Red Sox claimed both games of the day-night doubleheader, 6-2 and 4-1, sending the reeling Yankees back home licking their wounds.

Across 18 innings on Sunday, the Yankees mustered just nine hits — six of them from Jake Bauers and Gleyber Torres combined.

After being stifled by a Red Sox bullpen game in the afternoon, they were shut down by Brayan Bello in the nightcap, continuing to look punchless without Aaron Judge.

With most of their big bats going dormant in unison over the last two weeks, the Yankees have now lost eight of their last 11 games.

The Yankees scored in the first inning in each of the three games this series, though it hardly mattered much.

On Sunday night, they used a Bauers walk, a Torres double and an Anthony Rizzo groundout to take a 1-0 lead.

But it only stood up until the second inning, when Luis Severino gave up the first of his four runs (three earned) across five innings in another mediocre start.

The Red Sox took the lead for good in the fourth inning.

With the bases loaded and two outs, Reese McGuire reached on catcher’s interference by Kyle Higashioka, forcing in Alex Verdugo from third.

Severino escaped that bases-loaded jam with only the 2-1 deficit, but then loaded the bases back up with one out in the fifth inning.

He struck out Rob Refsnyder on a 98 mph fastball before Triston Casas roped a ground-rulouble to right field for the 4-1 Red Sox lead.