Hanhold, acquired in the Neil Walker trade, will need to be added to the Mets 40-man roster. The tall righty has a heavy sinker and sharp slider.
He has a 4.20 ERA, 1.27 WHIP, 2.90 FIP and 10.4 K/9 in 49.1 innings this year over four levels including Double-A Binghamton and Triple-A Las Vegas. The 24-year-old is a strong groundball pitcher that has allowed only two home runs this season.
Peterson, 27, has a 7.54 ERA and 1.46 WHIP in 22.2 major league innings this season for the Mets.