The Marlins recalled Kempner from Triple-A Jacksonville on Saturday.
Since his demotion to Triple-A on May 6, Kempner has allowed just two earned runs over 10.1 innings while posting a 12:5 K:BB for Jacksonville. His strong performance will now be rewarded through another trial in the majors as the roster replacement for Andrew Nardi (ribs), who was placed on the injured list.