The Padres opened two spots on their 40-man roster on Tuesday, when infielder Oscar Robles was claimed off waivers by the Phillies and Mauro Zarate was outrighted to the Triple-A Portland Beavers.
The Padres now have more flexibility to add players to their 40-man should they decide to make any moves. The Padres started play on Tuesday with a 10-16 record and are nine games back of the Arizona Diamondbacks in the National League West.
Zarate, who was claimed off waivers by the Padres last October, didn't have a record in six appearances for Portland, but had a 9.82 ERA. Zarate, 25, allowed 13 hits over 7 1/3 innings this season.
Robles, 32, who spent part of last season with the Padres, was hitting .208 in 14 games this season for the Beavers. He had a home run and 10 RBIs for Portland. Over parts of three Major League seasons, Robles hit .260 in 162 career games with the Padres and Dodgers.
San Diego general manager Kevin Towers will be in Portland next week to watch some of the franchise's top prospects: left fielder Chase Headley, second baseman Matt Antonelli, catcher Nick Hundley and pitcher Wade LeBlanc.
Headley, Antonelli and LeBlanc are on the 40-man roster.
Headley (.226), Antonelli (.216), Hundley (.232) and LeBlanc (6.98 ERA) have had a rough go at times in their first season above the Double-A level.
Corey Brock is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.