ARLINGTON, Texas (AP) The Texas Rangers have switched out relievers, recalling right-handers Anthony Bass and Luke Jackson from Round Rock and sending two other pitchers to that Triple-A squad.

Left-hander Alex Claudio and righty Phil Klein were optioned to Round Rock on Thursday, a day off for the Rangers.

Jackson, the 45th overall pick in the 2010 draft, is looking to make his major league debut. He was 2-2 with a 4.05 ERA in 33 Triple-A games.

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Bass worked 51 2-3 innings in 26 relief appearances at Texas before being optioned July 27.

Claudio didn't appear in a game after his recall July 29 for his third stint with Texas this year. Klein has a 6.75 ERA in four stints.

Left-hander Wandy Rodriguez became a free agent Thursday after clearing release waivers.