Out from behind curtain No. 2 came Travis d’Arnaud. In a season during which the Mets unveiled stud pitching prospect Zack Wheeler came an equally anticipated arrival last night when the 24-year-old d’Arnaud was in the lineup against the Padres for his major league debut. John Buck was placed on paternity leave after leaving the team Friday night for the birth of his third child yesterday in New York. Enter d’Arnaud a top catching prospect who will have through tomorrow’s game in Minnesota to prove he deserves to stay beyond Buck’s return. “It’s going to be a fun experience for me and my family that’s for sure” said d’Arnaud who grew up near Los Angeles and expected to have a contingent of family and friends at Petco Park last night. D’Arnaud made a strong impression on the Mets in spring training and likely would have received a promotion to the major leagues before midseason had he stayed healthy. But he broke his left foot at Triple-A Las Vegas in April leaving it questionable whether his Mets debut would come in 2013. “My foot feels normal back to normal like it was in April and I don’t even notice it at all any more” said d’Arnaud who was batting .304 with two homers and 12 RBIs in 19 games for Las Vegas. The Mets acquired d’Arnaud from the Blue Jays in December for R.A. Dickey in a deal that also netted stud pitching prospect Noah Syndergaard outfielder Wuilmer Becerra and Buck. The Blue Jays also acquired catchers Josh Thole and Mike Nickeas as part of the trade.