Became a Cardinal
Selected in the 21st round of the 2009 First-Year Player Draft.
Spent the season with Johnson City, where he pitched in 10 games including six starts. Rosenthal posted a 3-0 record with a 2.25 ERA, while striking out 30 in 32 innings pitched. He allowed just one home run and had an excellent 3.27 ground-out to fly-out ratio.
Appeared in 14 games for the Gulf Coast League Cardinals in his professional debut, going 4-1 with a 4.88 ERA. Fanned 26 and walked 10 in 24 innings.
The Cardinal Nation/Scout.com 2013 Top Cardinals Prospect #3
The Cardinal Nation/Scout.com 2012 Minor League Starting Pitcher of the Year
Texas League mid-season, post-season All-Star: 2012
The Cardinal Nation/Scout.com 2012 Top Cardinals Prospect #12
The Cardinal Nation/Scout.com 2011 Quad Cities River Bandits Starting Pitcher of the Year
Midwest League Pitcher of the Week: 8/18-24/11
Midwest League All-Star: 2011