The authors' purpose was to examine adolescents' reading motivation in relation to standardized assessments of reading comprehension and fluency. After a reading pretest, 60 ninth-grade students (M age = 14.9 years) were randomly assigned to two groups. Compared to those in the control condition, those administered brief oral feedback intended to improve motivation indicated an increased focus on mastery goals and greater perceived control during a reading posttest. No differences were found with regard to four other aspects of motivation. Students in the treatment condition, including struggling readers more specifically, did not score better on the posttest measures of reading comprehension or fluency. Hence, results failed to replicate Zentall and Lee's (2012) findings with younger readers. Findings are discussed with regard to the theoretical and practical implications for understanding reading motivation.