Last year 12 weeks of reliever Brad Zielger cost the Red Sox righthander Jose Almonte and second baseman Luis Alejandro Basabe, whom SoxProspects had ranked 18th in a Boston farm system that included Yoan Moncada, Andrew Benintendi, Anderson Espinoza, Rafael Devers, Michael Kopech, Sam Travis, Brian Johnson and Michael Chavis.
Seattle will get a year and about 11 weeks of 30-year-old righthander David Phelps, who has posted 0.3 fWAR in 44 appearances for Miami this year after posting 1.9 fWAR last year. At the time of the Red Sox trade, Ziegler has posted 0.5 fWAR in 36 appearances for Arizona after posting 0.6 fWAR the previous year. This year the 37-year-old Ziegler has posted 0.0 fWAR in 34 appearances as Phelps' teammate on the Marlins.