The A's designated southpaw reliever Jay Marshall for assignment to make room for Justin Duchscherer today, writes Susan Slusser of the San Francisco Chronicle. Marshall, 27 in February, spent most of the last two seasons in the minors. This year at Triple A he posted a 3.20 ERA, 5.3 K/9, and 2.7 BB/9 in 50.6 innings.
Marshall joined the A's as a Rule 5 claim from the White Sox in '06. The A's did their part and kept Marshall with the big club in '07, but the Red Sox claimed him off waivers after the season. The A's were able to claim him back a few months later.