The Mets traded for Yoenis Cespedes in the hours before the July 31 non-waiver trade deadline in 2015, after which he went on an unconscious run -- hitting 17 home runs and 44 RBI during the team's final 57 regular season games. As a result, Cespedes and the Mets went 36-21, won the NL East and reached their first World Series in 15 years.
In the days after the World Series, Cespedes entered the free agent market and pressure quickly mounted for the Mets to re-sign him. He reportedly had been seeking a five- to seven-year deal, but teams were concerned about his hip and legs and he received only short-term offers.