He'll make a start for the Rays on Saturday, after which he will likely return to Durham. Alex Cobb has been dealing with a cut on his finger, and the team wants to give the injury time to heal.
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The Rays were also considering calling up left-handed pitcher Alex Torres from Triple-A, but ultimately went with Archer. Archer has had success for the Rays in the past, starting four games in 2012 and pitching 29 1/3 innings. He had an ERA of 4.60, and coupled that with a 36/13 K/BB ratio.
Archer has an ERA of 3.96 in 50 innings for the Bulls this season, with a 52/23 K/BB ratio. He has been working on his command, and needs to continue to improve if he wants to solidify a spot in the Rays' rotation.
Acquired in the Matt Garza trade with the Cubs, Archer has become one of the better prospects in the Rays organization. He has a chance to be as good of a pitcher as Garza, but he needs to keep the ball in the park and stop walking so many batters. He, along with Hak-Ju Lee, show that the Rays are well on track to winning that trade.