Hector Santiago was a pitcher that was acquired by the Angels via trade before the 2014 season and the Angels primarily used him as a starting pitcher for the 2014 season, but he more or less proved to be the same type of pitcher that he had been in his couple seasons prior with the White Sox.  He showed that he had a decent left-handed arm that had some strikeout potential but walked a lot of batters and was inefficient with his pitch counts, and he finished the season with a 3.75 ERA, 1.36 WHIP, and 108 K/53 BB in 127.1 IP.

So entering the 2015 season, much of the same was to be expected from Santiago as he opened the season with a spot in the back end of the Angels rotation, but he has surpassed anyone’s expectations.  The Angels starting rotation looked to be in some big trouble this season with Garrett Richards starting the season on the DL, Jered Weaver having extremely diminished velocity, C.J. Wilson coming off a career worst season as a starter, and the 2014 surprise Matt Shoemaker surely unable to repeat his rookie season numbers.  But even with all those question marks with the starting pitching, it would have been hard to predict that Santiago would be the Angels’ best, most consistent and reliable pitcher through the first half of the season.  So we have to acknowledge the fine job that he has done to this point, and with another strong start on Friday at Seattle, Santiago will enter the All-Star break with a 6-4 record, 2.33 ERA, 1.10 WHIP, and 98 K/34 BB in 108.1 IP.  Unfortunately, there are some red flags for Santiago that call for some regression as we enter the second half of the season, and he may not be quite as fortunate from here on out.

Santiago currently sports the 3rd lowest BABIP among all Major League pitchers at .244.  Santiago’s low BABIP can possibly be substantiated by the fact that he has been the most extreme fly ball pitcher in the entire league this season with a 50.8% fly ball rate.  Fly ball pitchers are more capable of maintaining low BABIP marks due to the fact that fly balls that stay in play are generally easier to record for an out than ground balls, which can go for hits in a number of ways unless it is hit directly at an infielder.  So at first glance, his low BABIP isn’t a terrible issue, but then upon examining his hard hit and soft hit rates, it becomes much more of a question if the low BABIP is something that he can maintain.  Currently, his soft hit rate is the 11th lowest in the league at 15.3% and his hard hit rate is the 8th highest at 33.4%.  What this reflects is that when hitters are making contact against Santiago, they are generally able to avoid hitting it softly and instead they hit it at a medium impact or a hard impact — and of course logic will say that hard hit balls will go for base hits much more often than soft hit balls. So the fact that Santiago has been able to rank so well in BABIP despite being on pace for career worst soft and hard hit rates, it would suggest that he has been rather fortunate.

In Santiago’s favor though is that he has one of the better outfield defenses in the league, much in part to the reigning American League MVP Mike Trout who seems to track down a myriad of fly balls that seemingly few center fielders would be able to get to.  So as I mentioned about the Indians pitchers and how their poor defense grossly affects them in “Sometimes A Pitcher Is Only As Good As His Defense,” it also works in the opposite way with pitchers who have good defenses backing them.  So because Santiago has Trout and others roaming the outfield behind him, he’s going to get a lot of should-be gappers hit off him that will be caught, which helps keep his BABIP down as a fly ball pitcher.  But even so, he should see some sort of regression in the area if he continues to allow hard contact at such a high rate because even Trout can’t catch them all.

Another thing of note with Santiago is that his 88.9% strand rate is the 2nd highest in the league next to Zack Greinke. That type of strand rate is astronomically high as the league average tends to hover around 72.0% and last year’s highest was Doug Fister at 83.1%.  So Santiago is bound for some regression in this area, especially as a fly ball pitcher.  Fly ball pitchers generally allow more home runs, and home runs obviously clear the bases of all runners so that none of those base runners allowed would count as stranded/left on base.  And indeed, Santiago does allow his fair share of home runs at 1.08 HR/9 this season, which matches his career mark as well.  His career strand rate has been relatively high at 79.8%, so perhaps it is somewhat of a skill, but nonetheless it should begin to regress.  Looking at the other pitchers with a strand rate of 80.0% or higher this season, most of them are ground ball pitchers because pitchers with higher ground ball tendencies are able to induce ground ball double plays to strand runners.

One final caution regarding Santiago is his innings count.  He came up through the White Sox farm system as primarily a relief pitcher, and that is what the White Sox used him as initially when he reached the Majors as well.  So his career high in innings pitched is only 149 set in 2013, but he is currently on pace to finish the season with 203.1 innings pitched.  While it is not as great of concern as his hard hit rate, BABIP, and strand rate, it definitely is something to watch once he surpasses his previous career high.

Something very positive in Santiago’s breakout season thus far is his big improvement in his control, which has led to greater efficiency with his pitches and being able to work deeper into games.  His walk rates from 2012-14 have been 5.12 BB/9, 4.35 BB/9, and 3.75 BB/9.  However, this year he is all the way down to 2.82 BB/9 and is averaging 6.16 IP/start. And the improved walk rate is backed up by a career high first pitch strike rate of 59.3%.  So as long as he can keep getting ahead of hitters in the count, then he should be well on his way to a career best walk rate — it’s just the other things that we need to monitor as Hector’s possible Achilles heel.

Let’s take a look at the rest of Friday’s slate.

Continue reading →