The Los Angeles Dodgers designated left-hander Zac Rosscup for assignment Monday and added right-hander Casey Sadler to the major league roster. Rosscup signed with the Dodgers on June 12 after he was released by the Toronto Blue Jays and granted free agency on June 3. The 31-year old had a 6.00 ERA over seven appearances (three innings) in his second stint with the Dodgers.