When the season began, there appeared to be some serious questions about the Kansas City Royals bullpen, a pen that once was the most dominant in baseball. In fact, Fangraphs had them ranked as the 28th best bullpen in baseball coming into the 2017 campaign. The first week of the season didn’t dispel any of the concern with the Royals relievers, as they struggled throughout the Minnesota series and were quite susceptible to the walk. But one bad week or one bad month do not make a season and luckily the Royals have righted the ship, to the point that there have been a number of surprising performances from the bullpen helping the team scratch itself back to .500.

Let’s start with the numbers. The Royals have the 12th best bullpen in MLB according to fWAR, 8th best in the American League. They have the 8th best FIP, 11th best ERA, 9th best K%, and 10th best K-BB%. The Kansas City pen still has the highest walk percentage in the AL, although one has to wonder how much that first month of the season plays into that number. The Royals do have the 5th best HR/9 in the league and the 11th best WHIP. I am becoming a big proponent of WPA (Win Probability Added) and the Royals relievers have the 6th best in the league. Throw in the 4th best Clutch in the league (which at 1.18 has them in between Excellent and Great on the Clutch scale) and you have a bullpen that has allowed a few more runners than they would like but have performed well in those high leverage situations. The Royals also have the 3rd highest Soft Hit % in the league (21.4%) and the 6th lowest Hard Hit % (29.9%). Finally, since I like to break down the numbers as much as possible, looking at just fWAR here are the Royals pen month by month so far this year:

March/April- 0.1 (13th in the AL)

May- 0.8 (9th)

June- 0.8 (4th)

So what do all these numbers tell us? The Royals bullpen, while not dominating the way they used to, are coming into their own as the season progresses. If anyone is wondering why that is happening, you don’t have to look very far to see who is leading the way.

Let’s start with the guy who has been the most efficient and (until recently), the most overlooked. Scott Alexander has been almost dominating this year, producing a 1.38 ERA over 26 innings, a 2.91 FIP and a 20.2 K rate. But what really has been astounding is his 76.1% GB rate, which is the highest of his professional career. All those ground balls can be attributed to a ‘lights out’ sinker, which some have compared (at least success-wise) to Zach Britton of Baltimore. Alexander’s production has caused manager Ned Yost to use him more in high leverage situations and don’t be surprised if he continues to be a main cog in this Royals pen.

Peter Moylan has been a vital part of the bullpen since Day One this year, as he has been Ned’s ‘Go to Guy’ to get just a few batters out in tight situations. In 23.2 innings over 33 appearances this year, Moylan has a 3.81 FIP, 0.2 fWar and a 22.3 K rate. While his ERA is a bit bloated (6.46), his soft hit rate of 33.8% is the highest of his career and his WPA is sitting at a crisp 0.71. Moylan’s Left on Base % could see some improvement, but for the most part he has done what Yost has needed from him this year, which is to come in and extinguish fires.

The Royals weren’t for sure what they had with Mike Minor in the pen coming into the season, especially since he had been a starter his entire career. But so far he has been a welcome addition to the Royals bullpen. In his first year of relieving, Minor has posted a 1.93 ERA, a 2.47 FIP, 1.0 fWAR and an 82% left on base percentage. He has put up a solid 17.9% K-BB ratio and has seen his soft hit rate go up (29.2%) and his hard hit rate go down (24%), both career highs. One of the keys to his success this year has been his use of his slider, which he is using at 38.7% clip, easily the highest of his career. At one point it appeared the Royals might deal Minor come the trade deadline, but with the Royals back in the race he is probably more likely to be a key arm for Kansas City down the stretch.

Maybe the most welcome return to form is Joakim Soria. Much was written about Soria and his struggles last year, a year that for Soria was one to forget. But 2017 has been the complete opposite, as he has improved everything across the board. Pick a stat and it is better than it was last year…other than his walk rate, which has gone up just a smidge. But besides that, Soria has been one of the most consistent contributors in the Kansas City pen. In fact, here is a quote from Fangraphs back in March when they were compiling the piece I mentioned earlier, ranking all the bullpens in baseball:

 His strikeout rate was decent, but his walks went up and he gave up a bunch of homers, getting worse as the season went on. The homers probably should come down a bit, but that still won’t make him the pitcher whom the Royals thought they were getting before last season.

The home runs have gone down…but more than a bit. So far this year, Soria has yet to give up a home run (knock on wood) over 30 innings of work. If you believe he will assume about the same workload as last year, he is almost half way to his innings total of 2016 and has not given up a long ball. Last year, he gave up 10 round trippers. While Soria is still not the guy who was a consistent All-Star in Kansas City (and no one should expect that from him), he has been the perfect set-up man who the Royals envisioned he would be when they signed him back in the Winter of 2015.

You might have noticed I hadn’t even mentioned closer Kelvin Herrera yet, and there is a reason for that. Herrera has had his struggles this year but number wise, nothing major really stands out. In fact, his hard hit rate going up and the increase in home runs is the only big slight on his mark this year. He is still striking out people at a rate close to normal, and still walking about the same amount as well. The one aspect of his game that is different is the contact rate, which makes sense if you are someone who has watched many of his outings. Herrera has had an issue of getting behind in the count this year, leading him to leave a few pitches out over the middle of the plate. Herrera’s Z-Contact % (pitches hit inside of the strike zone) has seen a slight tick up this year (83.9 from 78.6% in 2016). In fact, Herrera has almost been too precise, leaving pitches inside the zone that normally he would leave just off the outer edges. This past week he has looked better, where his pitches have been either outside or inside and normally down, rather than down the middle. There is no reason for alarm, but more than anything other teams should worry; Herrera can (and my guess is he will)  improve in the second half.

Before the season started, I would discuss the Royals relievers and mention the same thing: what you see in April/May won’t be what you see by September. So far this year, Chris Young has been ousted, Matt Strahm has moved to the rotation and Kyle Zimmer has been pitching in relief down in AAA. If Zimmer gets the call, it could bolster a group of arms that have been steadily increasing their production month by month. I’ve had to stress to Royals fans these last couple seasons that the bullpens Kansas City had in 2014-15 were not normal. Having a pen that is THAT locked in is not the norm and only really comes along once in a blue moon. You shouldn’t expect the Royals relievers of today to be as dominating as they were with Holland and Davis leading the charge. But what they have now is a healthy substitute that we should be comfortable with during the team’s final three months of the season.