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Morning Report: Trevor Williams Will See Regression, But He Can Limit the Negative Impact

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Earlier this week I wrote about how the Pirates were looking like legit contenders. That was based on the fact that the team is currently winning, despite the lack of results from some of their expected top performers. The idea was that they would eventually get better performances from some of those top guys, offsetting some potential declines from the guys who are unexpectedly over-performing.

One of the surprises that I brought up was Trevor Williams. I mentioned that I expected him to eventually regress, as his numbers weren’t as good as his surface ERA. At the time of the article, Williams had a 2.29 ERA in 35.1 innings, but his 5.08 xFIP pointed to a serious regression, mostly due to his 2.6% HR/FB ratio.

In his last start, Williams gave up two home runs. This isn’t how regression works. You don’t have six starts where you are lucky in an area, then have one start where you’re equally unlucky in the same stat to make it even out. The idea is more that in all future starts, Williams will be closer to a 10% HR/FB ratio, rather than the 2.6% he had prior to the last start.

It’s possible that Williams could fall below the 10% mark. It’s also possible he could go above that mark. The league average is a 13.2% HR/FB ratio. Williams has been at 10.5% in his career. Pitchers typically need 400 fly balls before their HR/FB ratio stabilizes, and Williams has 200 so far, so that 10.5% isn’t exactly locked in.

That said, it would be unlikely for him to finish with such a low number, even at his increased 6.5% rate after his last start.

There were 134 pitchers who threw 100+ innings last year, and no one finished lower than 7.6%, with only two pitchers finishing below 8%. Only seven pitchers finished below 9%. There have been pitchers in the past who have finished with lower numbers, although that’s generally not a repeatable skill.

It’s possible that Williams could go throughout the year with a lucky HR/FB ratio. It’s doubtful that he would do this over his entire career though.

Making matters worse this year is the fact that he’s got a .209 BABIP and an 80.9% strand rate. The league average for starters this year is .286 and 72.7%. The career totals for Williams are a .281 BABIP and a 72.1% strand rate, so he should be expected to perform close to those averages. Again, he doesn’t have enough balls in play for a reliable stabilization rate, but until he reaches that point in any category, I’d expect the league average, which is what he’s showing so far.

What this means is that it’s not just an increase in home runs that Williams should see in the future. He’ll also see more balls in play falling for hits, and more runners scoring, rather than being stranded. His 4.17 FIP reflects these numbers, and the 5.02 xFIP adds in the normalized HR/FB ratio.

So what can Williams do to offset this?

For starters, he can increase his strikeout rate. He’s striking out guys at a 16.1% rate, which is down from 18% the last two years. More strikeouts means fewer balls in play, which will reduce the damage when his BABIP normalizes.

He could also reduce his walks. He has an 11.1% walk rate, up from about 8% prior to this year. If he’s expected to give up more hits, then offsetting those with fewer walks would help.

Finally, he could increase his ground ball rate. He had a 48% ground ball rate last year, but has been at 36.8% this year. The combination of more fly balls, plus the expected HR/FB correction, will not be good for him. The HR/FB stat is a rate stat, which means it doesn’t matter how many fly balls Williams gives up — he’ll see about 10% or more going for home runs. Fewer fly balls will mean fewer home runs.

I wouldn’t bank on Williams continuing his run of an ERA below 3.00. I’d enjoy it while it lasts, while realizing that he’s a prime regression candidate. But Williams can limit the impact of that regression with more strikeouts, fewer walks, and more ground balls. Considering he’s already put up better numbers in those areas than what he’s shown this year, it’s not out of the question to see him showing those improvements going forward.

Expect a regression from Williams, but hope he improves in those other key categories in the process.

TODAY’S SCHEDULE

Today’s Starter and Notes: The Pittsburgh Pirates lost 5-3 to the Milwaukee Brewers on Saturday night. The Pirates will send Chad Kuhl to the mound today for his seventh start. He pitched 4.2 innings in his last start, allowing four runs on four hits and two walks. In his two prior starts combined, Kuhl surrendered four earned runs over 12 innings. The Brewers will counter with right-handed pitcher Chase Anderson, who has a 3.38 ERA in 40 innings over seven starts, with 27 strikeouts and a 1.13 WHIP. He allowed four runs over 5.1 innings against the Cincinnati Reds in his last start.

The minor league schedule includes the second rehab start from Joe Musgrove, who went three innings for Bradenton in his first game. He moves up to Altoona today and is scheduled to throw four innings. Clay Holmes tries to bounce back from three runs and five walks in five innings during his last start. In his two previous outings, he threw shutout ball. West Virginia was rained out yesterday, so they will play a doubleheader today with Gavin Wallace returning from the disabled list in one game and Travis MacGregor starting in the second game. Wallace last pitched on April 26th and left after three innings. MacGregor had eight strikeouts in each of his last two starts. No starter is listed for Bradenton yet.

MLB: Pittsburgh (18-16) @ Milwaukee (20-14) 2:10 PM
Probable starter: Chad Kuhl (5.01 ERA, 28:10 SO/BB, 32.1 IP)

AAA: Indianapolis (14-12) vs Gwinnnett (10-17) 1:35 PM (season preview)
Probable starter: Clay Holmes (3.38 ERA, 15:10 SO/BB, 16.0 IP)

AA: Altoona (15-12) vs Erie (10-18) 2:00 PM (season preview)
Probable starter: Joe Musgrove (0.00 ERA, 0:0 SO/BB, 0.0 IP)

High-A: Bradenton (17-12) @ Charlotte (14-15) 12:35 PM (season preview)
Probable starter: TBD (0.00 ERA, 0:0 SO/BB, 0.0 IP)

Low-A: West Virginia (15-13) vs Hickory (9-17) 2:05 PM DH (season preview)
Probable starter: Gavin Wallace (4.95 ERA, 14:2 SO/BB, 20.0 IP) and Travis MacGregor (2.42 ERA, 36:6 SO/BB, 22.1 IP)

HIGHLIGHTS

From Indianapolis on Friday night, here is the home run from Kevin Kramer, followed by a strikeout pitch from Alex McRae. The homer is the third of the season for Kramer.

Tim Williams
Tim Williams
Tim is the owner, producer, editor, and lead writer of PiratesProspects.com. He has been running Pirates Prospects since 2009, becoming the first new media reporter and outlet covering the Pirates at the MLB level in 2011 and 2012. His work can also be found in Baseball America, where he has been a contributor since 2014 and the Pirates' correspondent since 2019.

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