A free agent at the end of the season, Walker is hitting.264 with 10 home runs and 36 RBIs in his second season in NY. He missed a chunk of the summer after suffering a torn hamstring attempting to leg out a hit.
The Mets almost traded Walker to the Yankees before the July 31 non-waiver trade deadline, but the deal was nixed due to medical concerns, according to a source. NY acquired Walker from Pittsburgh in a trade for pitcher Jon Niese in December 2015.
The Mets are still cleaning house, dealing Walker after already shipping out Lucas Duda (Rays), Addison Reed (Red Sox) and Jay Bruce (Indians). Walker figures to man second with the Brewers.
The Brewers entered Saturday's game against Cincinnati at 59-59, tied for third in the National League Central and three games behind the first-place Chicago Cubs in the division. The Mets have fallen out of the playoff race, entering Saturday at 52-61. Harvey has been on the disabled list since June 16 with a stress injury to his right scapula.