The Guardians strengthened what was already a strong starting rotation by acquiring Foster Griffin in a trade with the Nationals. How did the Guardians and Nationals fared in this trade? Guardians believe in Foster Griffin's breakoutNow 31 years of age, Griffin doesn't have the best track record in the big leagues. At the time of the trade, Griffin is sporting a 3.06 ERA in 22 starts (122.1 innings pitched), and he even made it to the All-Star Game. Knowing how the Guardians operate, Griffin was always going to be a tantalizing trade option.