I think it's fair to say Duffey did the job. The larger pattern from Duffey yesterday was the same we've seen from other starters: a rocky inning early, followed by scoreless innings. Is that Fangraphs pitch data you are using?
Or, I should have said he was promoted to AAA on the 23rd. Thanks. As for last year, the Twins might have left him in Rochester after that start, to see what happened -- just an opinion.
Good point. The FSL does have the lowest scoring of any of the leagues - bbref link here. For 2015, an ERA of 3.21 in the FSL would be an ERA of 3.52 and 4.25 in the other High A leagues. So, not too far off.