Worth noting from the Texas Rangers' minor-league system on Saturday:TRIPLE-A ROUND ROCK (44-48): DH Willie Calhoun had three hits, including a homer, and drove in three runs during a 7-5 loss to Oklahoma City (Los Angeles Dodgers). Calhoun has an 18-game hitting streak during which he is batting .425 in 73 at-bats.DOUBLE-A FRISCO (13-9, 37-55): RHP Jonathan Hernandez had his best start since being promoted to the Texas League, working five scoreless innings in an 8-4 win against San Antonio (San Diego).1B Preston Beck, of Dallas Bishop Lynch and Texas-Arlington, had four hits and is batting .353 for his last 34 at-bats.HIGH A DOWN EAST (9-15, 44-50): RHP Jason Bahr debuted in the organization after being acquired from San Francisco and allowed three runs in 4 1/3 innings during a 4-1 loss to Myrtle Beach (Chicago Cubs).