Toledo – Casey Fien (RHP)
Having had a whirlwind spring training that involved stops with the Boston Red Sox, Toronto Blue Jays, and then back with the Tigers, it was nice to see Fien finally settle in with a spectacular performance in May. Casey took the mound ten times for the Hens, totaling 14 1/3 innings. He allowed only nine hits and three walks for the month, and picked up two saves. All of that combined to help him notch a 1.26 ERA. Fien worked to locate his pitches more effectively last month, and the results were outstanding. Though he is no longer on the 40-man roster, Fien could be positioning himself for another big league opportunity in the near future if he continues pitching like this.
Runner-Up: LJ Gagnier (RHP)
Erie – Andrew Oliver (LHP)
The Tigers were extremely aggressive in their assignment of Oliver for his official professional debut, skipping over A-ball, and sending him directly to Double-A. Oliver had a rocky first month with Erie, posting a 5.03 ERA in four starts. That all changed in May, as he settled in and showed why the Tigers gave him a seven-figure signing bonus after last year's draft. In six starts for the Seawolves, Oliver posted a 3-1 record with a 2.36 ERA. In 34 1/3 innings, he allowed just 26 hits and eight walks, while striking out 26. Though it is just his first season in pro ball, Oliver's improvement and raw stuff could get him a big league taste before the end of the season.
Runner-Up: Zach Simons (RHP)
Lakeland – Charlie Furbush (LHP)
Furbush has been the talk of town amongst Tiger fans over the last month or so, as he has gone from solid minor league arm, to dominating the Florida State League. With an offense that was red-hot for much of May, the Flying Tigers provided Furbush with much of the support he would need in his six starts. Charlie notched a 1.76 ERA in 41 innings, but that might not be the most impressive numbers he posted last month. Furbush allowed only 20 hits and six walks, while holding opposing hitters to a .141 average against. Over that same span, he struck out an incredible 61 hitters. Scouts may be mixed on Furbush's future, but one thing is for certain, he is taking it to the FSL and the hitters he faced in May were no match.
Runner-Up: Luke Putkonen (RHP)
West Michigan – Giovanni Soto (LHP)
Now all of 19-years old after celebrating his birthday last month, Soto has taken to his first full-season assignment very well. After a solid first month with West Michigan, Soto turned it up a notch in May. In five starts last month, Soto picked up one complete game shutout, and logged 31 1/3 innings. Though the Whitecaps have struggled to pick up wins as a team, Soto's pitching has helped lead them to a few, and he finished May with a 3-1 record. In his 31-plus innings, he allowed 29 hits and six walks, with 24 strikeouts. Scouts still see projection in Soto's body and stuff, and there is a chance he could just be scratching the surface of his talents.
Runner-Up: Kenny Faulk (LHP)