The Miami Marlins were shut out for the first time on Monday, falling to the Cincinnati Reds, 2-0. But Janson Junk gave Miami everything he had. The rotation’s fifth starter — and the one most likely to lose a job at some point this season — had an excellent night even as he took his first loss of the season. In the bigger picture of the season, the performance was validation of including Junk in the rotation in the first place. It was a quality start for the right-hander. He went 7.1 inning, as he allowed seven hits, two runs (both earned), with a walk and three strikeouts as he trimmed his ERA to 3.09. In most games, that performance earns a pitcher a win. But Reds starter Brandon Williamson and three relievers quieted the Marlins for just three hits.…