With respect to Peterson, this will be his fourth call-up to the majors this season. In his previous call-ups, he made 19 appearances going 2-2 with a 7.54 ERA, 1.456 WHIP, and an 8.3 K/9.
Hanhold was the Mets return in the Neil Walker trade last season.
Hanhold pitches well in his 17 appearances for Binghamton going 3-1 with eight saves, a 2.84 ERA, 1.184 WHIP, and an 11.4 K/9. His strong pitching there led to his promotion to Triple-A Las Vegas.
In June, Hanhold suffered an oblique issue leading to a disabled list stint which lasted over a month. Whether it is due to the difficult pitching environment or the injury, Hanhold has not been able to replicate his success with Las Vegas.
Overall, Hanhold has made 35 appearances going 5-3 with eight saves, a 4.20 ERA, 1.277 WHIP, and a 10.4 K/9.
With Peterson already on the 40 man roster and the Mets having an open spot on the roster after the Jose Bautista trade, Hanhold can be added to the 40 man roster without the team making another roster move.