Worth noting from the Texas Rangers' minor-league system on Sunday:TRIPLE-A ROUND ROCK (57-69): LHP Zac Curtis had a scoreless inning for a save in a 3-1 win at Memphis (St. Louis). Curtis has four scoreless appearances with six strikeouts in 4 1/3 innings since being obtained from Philadelphia on a waiver claim.DOUBLE-A FRISCO (29-27, 53-73): Split a doubleheader with NW Arkansas (Kansas City).In the opener, a 6-3 loss, LHP Taylor Hearn allowed four runs in five innings.