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Ross Detwiler can use the confidence gained from 2012 to move up in the starting rotation.
The Nationals signed Dan Haren to replace Edwin Jackson as the fourth starter in a strong rotation.
In 286 starts over 10 seasons, Haren has a career record of 119-97 with a 3.66 ERA, 1,585 strikeouts and a 1.181 WHIP. In his postseason career, Haren is 2-0 in seven appearances and two starts, with a 3.26 ERA and 16 strikeouts on 19.1 innings pitched,
Haren was not signed with a position battle in mind, but incumbent fifth starter Ross Detwiler may have other ideas.
Detwiler has pitched in parts of only five seasons. In that time, he has compiled a meager record of 16-22 with a 3.74 ERA and 207 strikeouts in only 336.2 innings pitched. In his one postseason appearance, Detwiler earned a no decision after surrendering only three hits in six scoreless innings of work.
Ross Detwiler's career numbers may pale in comparison to those of Dan Haren. However, Detwiler actually had a better 2012 season than his new teammate. Detwiler finished 2012 with a 10-8 record in 164.1 innings pitched over 33 appearances and 27 starts, with a 3.40 ERA and a 1.22 WHIP to go along with 105 strikeouts and 52 walks.
Haren, on the other hand, compiled a 12-13 record while throwing 176.2 innings in 30 starts, totaling a 4.33 ERA and a 1.29 WHIP, with 142 strikeouts and 38 walks.
If both pitchers show signs of repeating their performances from 2012, then Ross Detwiler and not Dan Haren would earn a spot as the fourth starter in the Washington Nationals starting rotation.