ARLINGTON -- The Rangers placed shortstop Andres Blanco on the disabled list Friday with a stress reaction in his lower back. To replace him, they called up shortstop Omar Quintanilla from Triple-A Round Rock.

Blanco has been getting treatment on his back for about a week, and the Rangers weren't aware it was serious. But he was examined on Friday, and the diagnosis was that he would need at least a couple weeks of downtime.

Quintanilla, 29, was hitting .298 with five home runs, nine doubles, four triples and 25 RBIs in 51 games at Round Rock. A left-handed hitter, he was batting .408 in his last 11 games.

He played in the Major Leagues in parts of five seasons with the Rockies from 2005-09 and has a career batting average of .220. He can play multiple infield positions.

To make room on the 40-man roster, the Rangers placed pitcher Scott Feldman on the 60-day disabled list. Feldman, who pitches on Sunday for Round Rock in what is expected to be his last medical rehabilitation assignment, is still eligible to be activated at any time, because he has been on the 15-day disabled list since Opening Day.

Worth noting

• Outfielder Ronald Guzman, 16, who recently agreed to sign with the Rangers from the Dominican Republic, worked out at the Ballpark in Arlington on Friday. The Rangers are expected to make a formal announcement on his signing on Saturday.

• The Rangers have also reached an amateur free agent agreement with Venezuelan left-hander Yohander Mendez.

• Pitcher David Bush has cleared unconditional release waivers and is currently a free agent.

• Derek Holland, with a 6-0 victory over Oakland on Thursday, was the first pitcher in Rangers history to be knocked out of one start in the 1st inning and then throw a shutout in his next start. Senators pitcher Pete Broberg did it in 1971 when the franchise was still in Washington D.C. The last Major League pitcher to do so was Jim Bullinger for the Expos in 1997.

• The Rangers nine shutouts before the All-Star break matches a club record set in 1977.

• Holland is the first Rangers pitcher to throw multiple shutouts in a season since Aaron Sele in 1999. Kenny Rogers was the last left-hander in 1994, including his perfect game.