Jared Cross at ESPN wrote an article (insider) about which RPers teams should target. He has Perkins as the #1 RPer to target and notes the Twins should trade him not only because his value might never be higher but "even elite closers flame out quickly." Here is his data: "To prove this, I gathered data on pitchers like Perkins: relievers ages 26 to 32 with a quick ERA (kwERA) below 2.30 with between 35 and 90 relief innings in the years 1974 through 2009. This pool of 38 pitcher-seasons had an average kwERA of 1.90 and an ERA of 2.13 in the qualifying year (Year 0, see table). Reliever regression [TABLE=width: 0] [TR=bgcolor: transparent] [TH=bgcolor: #D6D6D6, align: left]Year[/TH] [TH=bgcolor: #D6D6D6, align: left]Innings[/TH] [TH=bgcolor: #D6D6D6, align: left]ERA[/TH] [/TR] [TR=class: last, bgcolor: transparent] [TD=bgcolor: transparent]0[/TD] [TD=bgcolor: transparent]68.9[/TD] [TD=bgcolor: transparent]2.13[/TD] [/TR] [TR=class: last, bgcolor: transparent] [TD=bgcolor: transparent]1[/TD] [TD=bgcolor: transparent]62.6[/TD] [TD=bgcolor: transparent]2.76[/TD] [/TR] [TR=class: last, bgcolor: transparent] [TD=bgcolor: transparent]2[/TD] [TD=bgcolor: transparent]53.5[/TD] [TD=bgcolor: transparent]2.83[/TD] [/TR] [TR=class: last, bgcolor: transparent] [TD=bgcolor: transparent]3[/TD] [TD=bgcolor: transparent]46.5[/TD] [TD=bgcolor: transparent]3.06[/TD] [/TR] [/TABLE] As a group, their performance fell off precipitously in the next year (Year 1) as regression to the mean would dictate that it must -- simply put, those selected for extreme performances in one year will, on average, be less extreme the next year. While their ERA decline slowed after Year 1, three years later, these pitchers were averaging one-third fewer innings with six of the 38 pitchers throwing no innings at all."