MIAMI \u2014 The Mets are not hitting, and another lapse by Robinson Cano raised questions about how hard they are trying.None of which helps the shaky job security of Manager Mickey Callaway.Sandy Alcantara needed just 89 pitches to throw a two-hitter in a duel with Noah Syndergaard, and the lowly Miami Marlins beat the reeling Mets, 3-0, on Sunday, completing a three-game sweep.A day after being shut out on one hit, the Mets dropped their fifth in row. And for the second time in three games, Cano failed to run hard after hitting a grounder.The latest unsightly loss to the Marlins (13-31), who have the worst record in the majors and who entered the series with seven losses in a row, is sure to intensify speculation about Callaway\u2019s status as the team returns to New York. The Mets (20-25) are in their longest losing streak of the year and are a season-worst five games under .500.\u201cI understand that everybody is disappointed \u2014 the fans, the ownership, myself, the team \u2014 because this is not who we are,\u201d Callaway said.Callaway again defended Cano, who failed to run when he hit a grounder that bounced off the dirt behind home plate and rolled a few feet fair. Cano stood at the plate questioning the call while the Marlins completed a 2-6-3 double play.\u201cI saw the ball hit, and it didn\u2019t even hit the plate, it hit behind the plate,\u201d Cano said. \u201cI thought it was a foul ball.\u201dOn Friday, Cano jogged to first when he grounded into an inning-ending 1-6-3 double play and later told Callaway he thought there were two out.\u201cThings are piling up on Robbie right now,\u201d Callaway said when asked about Cano\u2019s latest bad look. \u201cCome on, let\u2019s face it: The ball lands foul and spins into fair territory. He saw it hit foul, and by the time he looked back up, the ball had spun into fair territory and the play was over. Stuff happens like that when things are going bad.\u201dSyndergaard (3-4) allowed two runs in seven innings, and afterward defended Callaway, who is in his second year as manager.\u201cI respect the hell out of Mickey,\u201d Syndergaard said. \u201cIt\u2019s kind of bull what\u2019s going on right now with the speculation that there could be a change, because we\u2019re still early in the season and just one small step from putting this all together. It\u2019s certainly not on him.\u201dPart of the Mets\u2019 problem was Alcantara (2-4), who struck out eight, walked one and retired the final six batters for the Marlins\u2019 first complete-game shutout since Edinson Volquez tossed a no-hitter against Arizona in June 2017. It was the first complete game for Alcantara, a 23-year-old right-hander acquired from St. Louis in a trade for Marcell Ozuna before last season.He also had a bunt single that set up the first run and made a nifty behind-the-back grab of J. D. Davis\u2019s one-hopper in the first inning.\u201cI felt great,\u201d Alcantara said. \u201cI felt like a superstar about my complete game.\u201dInside PitchThe game took 1 hour 59 minutes to play. The first 19 batters went down in order, and the first three innings took only 31 minutes.