The 31-year-old Rzepczynski was a combined 1-0 with a 2.64 ERA in 70 games for Oakland and Washington this season. He then pitched three times in the NL playoffs for the Nationals.
Rzepczynski has made at least 70 appearances in each of the last three years. He’s also pitched for Toronto, St. Louis, Cleveland and San Diego in an eight-season career.
The 33-year-old Fien was 1-1 with a 5.49 ERA in 39 games for Minnesota and the Los Angeles Dodgers.
The 27-year-old Kiekhefer made his major league debut last season and pitched 26 times in relief for the Cardinals. Seattle claimed him off waivers from St. Louis last month.