Barton split the 2012 season between Oakland and Sacramento. He was batting .198 with a home run and four RBI in 37 games with the A’s when he was optioned to Sacramento June 2. Barton also hit .255 with eight home runs and 35 RBI in 74 games with the River Cats before returning to Oakland in September. He went 2-for-7 (.286) in nine games following his return and had a .204 average with the A’s overall.
Rosales batted .222 with two home runs and eight RBI in 42 games over three stints with Oakland last year. He started 31 games at four different positions, including 18 at second base, nine at shortstop, three at first base and one at third base. The 29-year-old right-handed hitter also batted .280 with 21 doubles, one triple, eight home runs and 47 RBI in 76 games with Triple-A Sacramento.
Rosario was acquired Wednesday from the Boston Red Sox for a player to be named later or cash considerations after spending the 2012 season in the Miami organization. He began the season at Triple-A New Orleans, posting a 1.04 ERA and 16 saves in 25 relief appearances. He also logged an 18.00 ERA in four relief appearances with the Marlins.
After agreeing to terms with Barton and Rosales, the A’s now have five players on their roster eligible for arbitration, including Jerry Blevins, George Kottaras, Brandon Moss, Chris Resop and Seth Smith.