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Dan Rozenson 

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How the Rockies have obtained and drafted slider-leaning pitchers.

Every day until Opening Day, Baseball Prospectus authors will preview two teams—one from the AL, one from the NL—identifying strategies those teams employ to gain an advantage. Today: unsolvable-yet-succeeding Oakland Athletics and the solvable-yet-losing Colorado Rockies.

Previous team previews: Giants | Royals | Dodgers | Rays | Astros | Padres

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The Rangers turned to a backup catcher to pitch in a blowout.

Colby Lewis allowed a Rangers club record 13 runs, though only 11 of the runs were earned.” –WFAA write-up

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And giving him very good grades.

I had a feeling we might see a position player in Detroit on Thursday, when the Tigers battled the Tribe for 13 innings and got only 10 outs from Robbie Ray. It could easily have been Don Kelly, who pumped 85 mph heat and a curveball in a 2011 game. But instead, in the top of the ninth, Brad Ausmus summoned utility infielder (“the very utility infielderiest of utility infielders,” according to Grant Brisbee) Danny Worth.

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Scouting the latest position player pitcher.

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Another position player climbs the mound, but he doesn't linger long.

Steve Tolleson is not flashy. A utility infielder who’s spent (small) parts of three seasons in the majors, he’s just trying to make himself useful. “Player for the Toronto Blue Jays and proud father and husband. Blessed more than I deserve,” is his Twitter self-description.

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The skinny on the pitch that's taking baseball by storm.

Would you be surprised if I told you that over a quarter of the curveballs delivered by major league pitchers in 2013 were thrown with a knuckle curve grip? I certainly was. This was one of the results of the first comprehensive study of knuckle curveballs in the major leagues, which I have conducted after months of data collection. It is limited to PITCHf/x data, but the large population sizes give us a good first look at what knuckle curveballs behave like relative to standard curves.

What is a knuckle curveball?
First, let me define clearly what this study entails. A curveball is a pitch that, when thrown from a conventional arm angle, will drop from its normal trajectory due to topspin. It is also typically thrown slower than other pitches, so it drops significantly from the effect of gravity, as well. The two most important fingers in the curveball grip are usually the middle finger and the thumb. The middle finger and thumb rest on or beside seams on opposite sides of the ball, as in this image. At release, the thumb and middle finger spin the ball forward, giving it the desired topspin. The index finger is not needed at all to throw the pitch, and a handful of pitchers even leave it off the ball entirely.

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The backup catcher with the nasty slider.

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Mike Carp showed off a knuckleball during a rare opportunity to pitch for the Red Sox.

“Any time you end up with a position player on the mound, it’s not been a good night,” John Farrell said after last night’s debacle of a game for his Red Sox. From Farrell’s position, it’s hard to disagree. But for a Yankee fan like myself and someone with particular interest in position player pitchers, last night was hilarious. Mike Carp’s pitching appearance was not the first position player outing of the season, but it was certainly the most notable. Most important for our purposes, Carp threw a total of 37 pitches—enough for a tentative scouting report.

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How the dominant Fernandez from Tuesday could become even better.

For those of you who never watched Sandy Koufax pitch, last night was an opportunity to see an equivalent performance (and if you subscribe to MLB.TV, you can watch it in perpetuity). Jose Fernandez was just that good, using a fastball-slurve one-two punch to strike out 14 over eight scoreless innings and induce a lot of weak contact against the Braves, a team that can slug a baseball pretty well.

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Four authors used different methods to watch the same pitcher make the same start. These are their reviews of that pitcher's performance.

In the movie Rashomon, a samurai is murdered. Four witnesses give four accounts of the murder, and out of one scenario come four very different narratives and three different killers. Do more angles get you closer to truth, or further from it? It's not clear.

What follows is an experiment. Four of us took a starter that none of us knew anything about: Pedro Hernandez, a Twins lefty making his 12th career start, on Saturday against the A’s. Without doing any research on Hernandez, the four of us watched the start from four different angles:

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Sam Fuld: comic relief and late-inning reliever.

In last week’s Lineup Card, I urged the Astros to re-sign Rick Ankiel and test him out again as a pitcher. As I explained, September allows teams to expand their active rosters to 40 men, so experimenting with Ankiel would be less likely to interfere with the “normal operations” of the club. He would also be playing for a team with no postseason hopes. Nothing would be lost for the Astros if he pitched poorly.

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A review of the outfielder's work on the mound this season.

It’s good fun scouting position player pitchers, but a measure of actual congratulations is owed to Casper Wells, who played the role of sacrificial lamb for the Philadelphia Phillies in Saturday/Sunday’s 18-inning marathon against the Diamondbacks. In Wells’ first pitching appearance this year, on June 28, he was called in for the ninth inning of a laugher, a 19-10 loss at the hands of the Indians. Wells was a member of the White Sox way back then.

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