Should Mets be concerned with Mark Vientos' hitting woes?

Heading into the New York Mets' April 14 game against the Minnesota Twins, Mets third baseman Mark Vientos had the 14th-worst WAR (-0.4) among all qualified MLB.
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Heading into the New York Mets' April 14 game against the Minnesota Twins, Mets third baseman Mark Vientos had the 14th-worst WAR (-0.4) among all qualified MLB.