WASHINGTON — Here’s how it’s going for the Phillies: In the 157th game of the season, with a playoff berth in sight, against the worst team in baseball, infielder Nick Maton came on to pitch with a nine-run deficit in the eighth inning. Wild-card fever. More like a fever dream. A September slide bled into October on Saturday as the Phillies got trounced, 13-4, by the Washington Nationals in the first game of a doubleheader that again was being threatened by ominous weather. Kyle Gibson gave up seven runs in six innings, but the defense opened the door to a five-run second inning. And once agai…