Why are the Braves moving Martin Prado to left field instead of Dan Uggla?

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David O’Brien of the Atlanta Journal Constitution reports that Martin Prado had no problem with the Braves’ request that he move to left field following the trade for Dan Uggla.

General manager Frank Wren talked to Prado after making the trade and quoted the All-Star infielder as saying: “I just want to be a part of this team. I want to contribute. I don’t care where I play.”

Prado deserves credit for taking that stance when many other players have scoffed at position switches, but it’s unclear if keeping Uggla at second base and moving Prado to left field makes sense for the Braves in the first place.

Uggla is universally regarded as a poor defensive second baseman whether you trust your eyes, error totals, mainstream perceptions, or advanced defensive metrics. Prado doesn’t fare exceptionally well in advanced defensive metrics either, but he rates better than Uggla and is generally perceived as clearly above average at second base. So why not use Prado at second base and move Uggla to left field?

On paper that seems like a relative no-brainer that would make the Braves’ defense better, but there are a few other factors at play. For one thing Prado has quite a bit more experience as an outfielder, albeit mostly in winter ball. Beyond that it’s possible Uggla would balk at being asked to switch positions one season away from free agency, as his market value as a left fielder could be quite a bit different than as a second baseman.

And last but not least the Braves are planning for 2011 with the idea that they may need to account for Chipper Jones being out of the lineup for long stretches. Prado would be the fill-in for Jones at third base and it’s likely easier to move him back to the infield and plug in another outfielder than it would be to have Uggla shifting back and forth.

Uggla at second base and Prado in left field probably makes the Braves’ defense worse, but deciding where to play them isn’t quite that simple.

Blue Jays place Aaron Sanchez on 10-day disabled list

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The Blue Jays placed right-hander Aaron Sanchez on the 10-day disabled list with a contusion in his right index finger, per a team announcement on Saturday. The assignment is retroactive to Friday. In a corresponding move, righty Marcus Stroman was activated from the DL (right shoulder fatigue) and will take the mound for the Blue Jays at 9:07 PM ET tonight.

Sanchez, 25, is in his fifth season with the club. He hasn’t looked his sharpest so far this year, going 3-5 in 15 starts with a career-worst 4.52 ERA, 5.1 BB/9 and 7.6 SO/9 through 79 2/3 innings. It’s not yet clear how long he’ll be sidelined, though he could miss as little as one turn in the rotation before returning to the roster in the next week or two.

Sanchez isn’t the only struggling starter in Toronto’s rotation, either. Per MLB.com’s Gregor Chisholm, the team placed southpaw Jaime Garcia on the DL (right shoulder tenderness) as well, with lefty reliever Tim Mayza scheduled to take his spot on the roster. In 13 starts this season, Garcia carried a 2-6 record, 6.16 ERA, 4.5 BB/9 and 8.2 SO/9 over 61 1/3 innings. Any further decisions pertaining to the rotation — including Tuesday’s starter against the Astros — have yet to be publicly addressed.