Before his call-up to the big leagues, Robertson had been at Triple-A Sacramento, where he was 4-0 with two saves and a 1.93 ERA in 18.2 innings. He could return to Sacramento in a week to 10 days.
Also appearing that game was right-hander Kevin Deaton, who was making his fourth rehab assignment for the A's Rookie League team. Deaton has been on the Double-A Midland DL since April. He made only one appearance for the Rockhounds before being hurt, allowing two runs in five innings.
He has been pitching in relief in Arizona, but was slated to be a starter at the beginning of the season. Deaton has had injury problems throughout his minor league career. He missed all of last season with injury.
The A's also announced today that right-hander Mike Mitchell would be taking the next step in his rehab program. He will be pitching for the High-A Stockton Ports. Mitchell had appeared in four games for the A's Rookie League team. He allowed six runs in 3.2 innings in Arizona.
Mitchell was a candidate to join the A's bullpen at the end of spring training, where he was very impressive. However, he sustained a tear in his labrum at the end of camp and had to be shut-down. Mitchell has been rehabbing the injury without surgery and if he continues his progress, he should be back in Sacramento in a week or so. Mitchell could be a candidate to join the depleated A's bullpen in August if he shows well in Sacramento.
In other, no-so-good injury news, right-handers Chad Lee and Kevin Bunch have been shut-down indefinitely. Lee was the A's fourth round pick last season out of Barton Community College. He has been sidelined with shoulder problems all season. Bunch, a seventh round pick out of high school in 2005, has also been sidelined with injuries all season.