Tyler Chatwood AP

Tyler Chatwood headed to disabled list with hamstring strain

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Troy Renck of the Denver Post reports that Rockies right-hander Tyler Chatwood will be placed on the disabled list with a left hamstring strain. The move will be made prior to Wednesday’s game, when right-hander Jordan Lyles will be called up to replace him and start against the Marlins.

Chatwood actually suffered the injury while legging out a triple during a Cactus League game on Friday. He was able to make it through a bullpen session yesterday, but the Rockies are concerned about doing things like running the bases and covering first base. The hope is that he’ll make one rehab start and return to the rotation on April 12 against the Giants.

Chatwood, 24, posted a 3.15 ERA and 66/41 K/BB ratio over 111 1/3 innings last season. His 58.5 percent ground ball rate was second-highest among pitchers with at least 110 innings pitched.

Wild Card, Division series umpires announced

Angel Hernandez
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Major League Baseball just released the umpire assignments for the Wild Card Game and the Division Series. As always, the basis for these assignments is a proprietary, scientific calculation undertaken by Major League Baseball, mixing in (a) skill; (b) seniority; and (c) trolling of baseball bloggers who, unlike 99% of the rest of the world actually know the names and track records of various umpires and who are easily riled.

Which is to say that, while we have no Joe West in the early playoff rounds this year — too obvious, perhaps? — we do get an Angel Hernandez.

Here are the assignments. The asterisks represent the crew chief of each unit. Guys with little up arrows next to their names are regular season crew chiefs in their own right. Print this out and keep it near your television so you know who to yell about before the broadcasters tell you who to yell at:

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Which teams improved and declined the most in 2015?

Joe Maddon

I was curious about which MLB teams changed their fortunes the most this season compared to last year, so I crunched the numbers.

First, here are the biggest win total improvements from 2014 to 2015:

+24 Cubs
+21 Rangers
+16 Astros
+15 Diamondbacks
+13 Twins
+11 Mets
+10 Blue Jays
+10 Cardinals
+10 Pirates

The top five teams on the biggest-improvement list all had managers in their first season on the job, led by Joe Maddon joining the Cubs after tons of success with the Rays. Also worth noting: Of the nine teams with the biggest win total improvement, eight made the playoffs. Only the Twins improved to double-digit games and still failed to make the playoffs.

Now, here are the biggest win total declines from 2014 to 2015:

-20 Athletics
-16 Tigers
-15 Orioles
-14 Brewers
-13 Nationals
-13 Angels
-12 Braves
-12 Reds
-11 Mariners

Not surprisingly, a whole lot of those teams have changed managers, general managers, or both. And a couple more may still do so before the offseason gets underway. Oakland retained manager Bob Melvin despite an MLB-high 20-win dropoff and just promoted Billy Beane from general manager to vice president of baseball operations.