NEW YORK — Jose Quintana extended his scoreless streak to a career-high 22 2/3 innings and Brandon Nimmo's three-run homer capped a nine-run fourth as the surging New York Mets beat the Washington Nationals 10-0 on Wednesday night to finish a three-game sweep.
Luisangel Acuña homered again for the Mets (84-68), who have won 15 of 19. They moved a season-high 16 games above .500 and remained tied with Arizona for the second of three NL wild cards — two games ahead of Atlanta for the league's last playoff spot.
''I'm pretty much convinced now we're not in the regular season anymore,'' Nimmo said. ''We're in playoff baseball and every win is extremely important. It decides whether we keep playing or not.''
Acuña, Mark Vientos and Starling Marte each drove in two runs as the Mets followed a 10-1 victory Tuesday night with another blowout of Washington. New York finished 11-2 against the Nationals this season, its best record against one opponent since going 10-1 versus the Los Angeles Dodgers in 1988.
''We're close to the finish of the season and we're in good position,'' Quintana said. ''We feel really strong.''
Quintana (10-9) allowed two hits, walked two and struck out four in seven innings to complete his season-long dominance of the Nationals. He blanked Washington for 21 innings over three starts — the most innings a Mets pitcher has thrown in one season against an opponent without allowing a run.
''He doesn't throw many balls right over the heart of the plate,'' Nationals manager Dave Martinez said. ''He nibbles a lot, but you've got to get up there and be ready to hit when it does come over the plate.''
Quintana hasn't allowed a run since the third inning against the Chicago White Sox on Aug. 31. His previous career-best scoreless streak was 20 2/3 innings in 2014.