Mets’ deal with Neil Walker goes bust

PORT ST. LUCIE — The Mets and Neil Walker remained far apart on a potential contract extension Monday, to the point team officials believe the proposal is probably dead, according to an industry source.

Walker accepted a qualifying offer worth $17.2 million for this season, and there is thought the club was looking for a new deal that would have reduced its 2017 payout while giving the second baseman two additional years of security.

The two sides discussed a three-year deal in the offseason worth about $40 million.

Walker, 31, is coming off September surgery for a herniated disk in his back. The Mets like his offensive upside – he hit 23 homers last season in 113 games – and view him as…