Worth noting from the Texas Rangers' minor-league system on Friday:TRIPLE-A ROUND ROCK (46-52): CF Drew Robinson extended his hitting streak to 12 games during a 6-3 loss at Omaha (Kansas City). Robinson is hitting .426 for 54 at-bats during the streak.DOUBLE-A FRISCO (16-12, 40-58): RHP Jonathan Hernandez continued to struggle in the Texas League, allowing five runs in 4 1/3 innings during an 11-10 loss in 10 innings to San Antonio (San Diego).