Saturday, July 31, 2010
Measures of Qualls-ity
Posted by Harry PavlidisArizona has shipped Chad Qualls to the Rays, eliciting responses ranging from anger to mockery to happiness.
Qualls is having an off year, his worst showing of the past four campaigns. It's just not as bad as his bloated ERA indicates. Using pitch-by-pitch linear weights to derive "ERA", both rvERAe (based on batted ball types) and rvERAa (based on actual hits and outs) have jumped for Qualls in 2010. This is along with an apparent downward trend in both whiff and ground ball rates.
| Year | rvERAe | rvERAa | Whiff | GB% |
| 2007 | 3.32 | 3.50 | .293 | 61 |
| 2008 | 3.33 | 2.66 | .247 | 58 |
| 2009 | 3.10 | 3.93 | .214 | 59 |
| 2010 | 4.04 | 7.28 | .180 | 56 |
Not a stud, not a dud. You may even expect Qualls to regress towards his career/recent levels—improve, in other words.
Harry Pavlidis admits he has a baseball problem. He is a member of Complete Game Consulting and has his own blog, Cubs f/x. Feedback, questions and comments are appreciated - Email harrypav@gmail.com and Twitter @harrypav
He looked GOOD vs the Mets Friday night