Originally written May 21, 2013 on Cardinals Fan in Cubs Land:
After a bumpy start to the season, Trevor Rosenthal has settled into his setup role nicely.  Since April 24th, he has allowed only 1 unearned run in 9.2 IP.  He has seen his ERA drop from a high of 5.00 on April 17th to the current low of 2.42. However, despite his run of success, there is one thing that concerns me, Mike Matheny has been using Rosenthal A LOT. Rosenthal has appeared in 23 of the Cardinals first 44 games, which puts him on pace for about 85 appearances for the year.  While it is not unheard of for a team to use a pitcher that much, its rare for a team to do that to someone under the age of 25.  Since 2000, only 4 pitchers under the age of 25 have appeared in more than 81 games in a season:  Oscar Villareal, Matt Capps, Jonathan Broxton and Joe Smith. Oscar Villareal appeared in 86 games in his rookie season at the age of 21.  He reported a sore elbow the next spring and later developed rotator cuff issues and has not been the same pitcher since. Matt Capps appea...
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