In what was arguably his strongest season in the organization in 2011, Washington Nationals' 2009 22nd Round Draft pick Danny Rosenbaum went (9-6) with a 2.52 ERA, 52 walks (2.73 BB/9) and 135 Ks (7.09 K/9) in 26 games, 25 of them starts and 171 ⅓ IP between High-A Potomac (132 IP) and Double-A Harrisburg (39 ⅓).
In a full season with the AA Senators in 2012, the 6'2'' southpaw put up a 3.94 ERA (3.41 FIP) in 26 starts and 155 ⅓ IP.
That winter, the then-25-year-old left-handed was selected by Colorado in the Rule 5 Draft, but he was returned to the Nationals in March of 2013 when he didn't make the Rockies' Opening Day roster.
In 28 starts and 158 ⅓ IP at Triple-A Syracuse in 2013, Rosenbaum posted a 3.87 ERA (4.16 FIP).
In May of 2014, Rosenbaum underwent surgery to repair a torn ulnar collateral ligament in his left elbow.
He was cleared to start throwing again this past December, as he announced on Twitter.
This morning, the Washington Nationals announced that they traded Rosenbaum to Boston return for catcher Dan Butler, 28, who made his MLB debut last season after six seasons in the Red Sox' system over which the right-handed hitting backstop put up a combined .256/.349/.416 line.
The Nationals describe Butler in a press release on the deal as a "strong defensive catcher."
The addition of another minor league backstop comes a day after the Nationals signed veteran catcher Steven Lerud on a minor league deal.
The Red Sox designated Butler for assignment last week.
Boston Globe writer Nick Carfardo was the first to announce the trade this morning after Rosenbaum tweeted out thanks to the Nationals' organization:
Red Sox deal catcher Dan Butler to Nationals for pitcher Danny rosenbaum— Nick Cafardo (@nickcafardo) January 14, 2015