His peripherals are actually about the same as last season. While he is striking out more batters this year (10.23 v 8.11 last year) he is walking more people, but his K/BB is identical to last year. His 65% strand rate (rate where baserunners score) isnt too far from average. He hasnt given up a HR this year yet. His LD rate is a tad high, but his GB/FB rate is also higher than average, so those should even out and not affect him too much. His infield hit% is 18%, compared to last years 6%, so that should regress as well. His average fastball is down 1.3 MPH to 92.4 MPH, while his slider has raised 1.2 ticks to 86.6 MPH. His changeup is the same velocity, but his split finger has dropped a MPH too to 84 MPH.
   His fastball was 1.55 runs above average/100 pitches last year, but is actually .3 runs BELOW average per 100 pitches this year. His slider also went from about 1 run above average/100 pitches to average this year. The real problem has been the change however, going from his best pitch last year (3.73 runs above average/100) to absolutely awful (-10 runs below average/100). His usage of the changeup has also dropped from 12.5% last year to 1% this year. His split finger has improved over a 1/2 run however to 2.74 runs above average/100.
   The main problem however is his BABIP (batting average on balls in play). This is usually completely out of a pitchers control (average is around .300), and Arredondo’s is .422, which adds alot of baserunners which have come around to score.
    In conclusion, it seems like Arredondo has lost confidence in his change because his fastball velocity is down. Coupled with his increase of velocity in his slider, it doesnt provide enough change of speed to keep batters guessing. His numbers will improve however because he has been extremely unlucky. His movement has been pretty much the same on his pitches (horizontal and vertical) although his slider is sinking more, and running in on righties instead of away from them this year.