Must-click link: What does a "No. X starter" mean, exactly?

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When talking about pitchers and rotations people throw around terms like “No. 1 starter” or “No. 3 starter” constantly because it serves as a sort of common understanding about ability and upside.
However, one of the problems with using that terminology comes when not everyone has the same definition of how great a pitcher has to be to qualify as a “No. 1 starter” or how low the threshold is for a pitcher to fit the bill as a “No. 5 starter.”
Bryan Smith at Fan Graphs crunched the numbers and put together a very interesting, detailed look at exactly how each spot in the rotation tends to perform.
Bryan Smith: Numbers for the Numbered Starters
Many of the results surprised me quite a bit and my main takeaway from the analysis is that people tend to dramatically overstate how good third, fourth, and fifth starters are on most MLB teams.

Yu Darvish lands on 10-day disabled list again with triceps tendinitis

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Bad news for the Cubs’ Yu Darvish: The right-hander is headed back to the disabled list with right triceps tendinitis, the team announced Saturday. It’s the second such assignment for Darvish this season, but the first time he’s been sidelined with arm issues. Neither the severity of his injury nor a concrete timeframe for his recovery has been revealed yet, but the move is retroactive to May 23 and will allow him to come off the DL by June 2, assuming all goes well.

Prior to the injury, Darvish went 1-3 in eight starts with a 4.95 ERA, 4.7 BB/9 and 11.0 SO/9 through 40 innings. Needless to say, these aren’t the kind of results the Cubs were hoping to see after inking the righty to a six-year, $126 million contract back in February, though the circumstances affecting his performances appear to have largely been out of his control. He missed a start in early May after coming down with the flu and has struggled to pitch beyond the fifth inning in five of his eight starts to date.

The Cubs recalled left-hander Randy Rosario from Triple-A Iowa in a corresponding move. Rosario has yet to amass more than five career innings in the majors, but has impressed at Triple-A so far this year: he maintained an 0.97 ERA, 2.8 BB/9 and 6.1 SO/9 through 19 1/3 innings in 2018. As for Darvish’s next scheduled turn in the rotation, Tyler Chatwood is lined up to take the mound when the Cubs face off against the Giants in the series finale on Sunday. A starter for Monday night’s game has yet to be determined.