Putnam has a 2.57 ERA for the month of May after throwing seven innings spread across seven games.
While his season ERA is 3.24, Putnam has improved after a slow start to the season, during which he gave up three runs in just 2.1 innings. Since that rough patch, Putnam has thrown 14 innings and posted an ERA of 1.88 and a 1.05 WHIP. His steady improvement will only strengthen a White Sox bullpen that's among the league's top six in terms of opponent batting average and ERA.