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For the first two months of this past season, Lucas Duda was the primary starting left fielder. However, in June, Duda got hurt and was sent to the disabled list. As a result of Duda's injury, subpar performances from other outfielders, and the team's overall lack of speed, the Mets traded pitcher Collin McHugh to the Rockies for Eric Young Jr.
Young quickly became the Mets' left fielder for the rest of the season. Despite batting just .249 with a .310 OBP, Young certainly brought some much needed speed with him. He led the National League with 46 stolen bases, with 38 of them being as a Met. Young was also serviceable defensively, with a .989 fielding percentage and just two errors all season.
Whether Young retains his starting position in left field in 2014 is unknown. He is under team control, but the Mets can find a good enough upgrade, they could use Young as a fourth outfielder and pinch-running specialist. Regardless, Young will almost certainly be a part of the Mets' 2014 plans in one way or another.
Nothing is certain at left field yet for the long-term future. Young is one option, but internally, there are other young options in Cesar Puello, Brandon Nimmo and Cory Vaughn, among others. And of course, there are also the possibilities of the Mets signing a free agent or making a trade for a new left fielder. As a result, it's currently too early to really speculate who will be playing left field for the Mets in 2015 and beyond.