PHOENIX — MJ Melendez was in tears following a visit to the manager’s office near the end of spring training. The outfielder had just learned he wouldn’t be breaking camp with the Mets, and his season would begin at Triple-A Syracuse, bringing no guarantee his major league career would continue. “I cried a lot that day, just because I know the work that I put in,” Melendez said before going 0-for-4 in the Mets’ 3-1, 10-inning win over the Diamondbacks on Friday night. “I know the spring was going well, and I had a chance to go to the WBC and thought I was going to play there and didn’t really play as much as I thought. I was just pretty sad in that moment.” It didn’t take long for Melendez to receive his opportunity. When Jared Young was placed on the injured list April 15 with a meniscus tear in his left knee, the Mets recalled Melendez, giving him an opportunity to play against right-handed pitching.…