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Is changing managers in the middle of the season a good idea?

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In honor of the firing of Bob Geren, The Common Man updates and re-presents his study from a year ago in which he examined whether changing managerial horses in midstream actually helps teams.  The short version: eh, not really, at least from a won-loss perspective.  But it’s entirely possible — and in the case of Geren, probable, based on what we’re hearing — that not changing him would have been way worse due to the risk of even more clubhouse strife.

Oh, one other random note on Geren: John Shea of the Chronicle tweeted a little while ago that Billy Beane said that one of the reasons the move was made now was because Bob Melvin was available.

Hey, good luck to Melvin and the A’s and everything, but he’s been available for, like, two years now, and he hasn’t exactly made anyone jump at him.  And I’m sure that, had Beane waited three months to fire Geren, Melvin would have been available then too.  So, nice not to throw Geren under the bus here, Billy, but there was a reason why he was fired today, and it had little to do with the once-in-a-lifetime opportunity to snag The Bob Melvin.

The Rockies are promoting outfield prospect David Dahl

SAN DIEGO, CA - JULY 10:  David Dahl of the U.S. Team looks on prior to the SiriusXM All-Star Futures Game at PETCO Park on July 10, 2016 in San Diego, California.  (Photo by Harry How/Getty Images)
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In a wave of prospect advancement news on Sunday, the Rockies have joined the fray. The Astros are calling up Alex Bregman. The Diamondbacks are calling up Braden Shipley. And the Rockies will call up outfield prospect David Dahl on Monday, Nick Groke of The Denver Post reports. The Rockies are expected to designate outfielder Brandon Barnes for assignment to create roster space.

Dahl, 22, was selected by the Rockies in the first round — 10th overall — in the 2012 draft. He started the season at Double-A, batting .278/.367/.500 with 13 home runs, 45 RBI, 53 runs scored, and 16 stolen bases in 322 plate appearances. He earned a promotion to Triple-A Albuquerque earlier this month. In 16 games there, Dahl has hit an outstanding .484/.529/.887 with five homers, 16 RBI, and 17 runs scored in 68 plate appearances.

Dahl is considered the Rockies’ second-best prospect and #40 overall in baseball according to MLB Pipeline. He got some camera time during the 2016 Futures Game two weeks ago, going 0-for-2.

David Robertson and adventures with the win statistic

CHICAGO, IL - JUNE 26:  David Robertson #30 of the Chicago White Sox pitches in the 9th inning for a save against the Toronto Blue Jays at U.S. Cellular Field on June 26, 2016 in Chicago, Illinois. The White Sox defeated the Blue Jays 5-2.  (Photo by Jonathan Daniel/Getty Images)
Jonathan Daniel/Getty Images
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David Robertson got the win in both White Sox victories today, a double-header versus the Tigers. In the first game, he got the final out of the eighth inning and pitched a scoreless ninth before the White Sox walked off on an Adam Eaton RBI single.

It was the second game that made things interesting. Robertson took the mound at the start of the ninth inning staked to a 4-1 lead. He’d fork up a leadoff home run to Nick Castellanos. Then, after getting two outs, served up another solo shot to Tyler Collins followed by a game-tying Jarrod Saltalamacchia dinger. Robertson would get out of the inning without any further damage.

In the bottom of the ninth, Melky Cabrera sent the White Sox home winners again, drilling a walk-off RBI single. That gave Robertson the win, his second of the afternoon. As Baseball Tonight notes on Twitter, Robertson is the first player in the last 100 years to give up three home runs in an inning or fewer and still wind up with the victory.

Robertson has had a rough go of it since the All-Star break. He yielded four runs in his first appearance back on July 18. On the season, he’s saved 23 games in 27 appearances with a 4.46 ERA and a 50/21 K/BB ratio in 40 2/3 innings.