Players busted for PEDs don’t show any notable uptick in performance

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A week after ESPN’s Buster Olney decided that Melky Cabrera’s excellent-so-far 2014 season justifies people assuming he’s back on PEDs, ESPN’s Dan Szymborski dives into the numbers and shows that such a decision is not based on any evidence at all:

Despite the rhetoric surrounding PEDs, players caught for steroid/testosterone use do not show a pattern of overperforming their projections in the years leading up to the drug suspension or a pattern of underperforming their projections in the years after a drug suspension.

All of this is based on Szymborski’s ZiPS projection system, which shows that Cabrera is doing about what you’d expect him to do this year. And that, as a group, guys busted for PEDs don’t really deviate too much from their expected performance one way or another before, during or after they are caught for PEDs.

Obviously there are a lot of caveats in play here. Small sample sizes, imperfect data about when guys start and stop taking PEDs and, of course, the flaws any projection system, even one as generally reliable as ZiPS, brings to the table.

But if you’re making a case for something — and Olney and others who are questioning the legitimacy of Melky’s performance this season are clearly making a case for something — it’s incumbent upon you to present some evidence. Szymborski’s analysis doesn’t necessarily prove anything about the efficacy or lack thereof of PEDs. But it has far more evidence on its side than anything people are hurling at Cabrera lately.

Joe Musgrove shut down with ab discomfort

Joe Musgrove
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Pirates right-hander Joe Musgrove is done for the year after suffering an abdominal wall muscle strain and stress reaction in his pelvic bone. While he isn’t expected to undergo surgery or miss additional time in 2019, he’s been prescribed six weeks of rest before resuming any baseball-related activities.

Musgrove, 25, finished out his third year in Pittsburgh with a 6-9 record in 19 starts, backed by a 4.06 ERA, 1.8 BB/9, and 7.8 SO/9. Despite logging a career-high 115 1/3 innings at the major league level, he’s also been dogged by a string of injuries, from the shoulder strain that robbed him of eight weeks at the start of the season to an index finger infection that kept him sidelined for a minimum 10-day stay on the disabled list in June.

While he works his way back up to full strength yet again, rookie right-hander Nick Kingham is expected to cover for him and will make a spot start during the Pirates’ series finale against the Brewers on Sunday. The 26-year-old righty hasn’t started a single game for the team since August 1, and currently carries a 4.69 ERA, 2.7 BB/9, and 8.1 SO/9 over 71 innings out of the rotation and bullpen.