Objectives: To examine the efficacy of a mental skills package to both improve consistency and level of performance in cricketers, and to investigate the influence of different performance measures on cricketing performance. Method: Semi-professional cricketers (n=16) were matched into experimental and control groups. Cricketing performance was monitored subjectively and objectively across two seasons. Prior to the second season, the experimental group were provided with an intervention package consisting of goal-setting, activation regulation, self-talk, mental imagery and concentration. Results: Data from two, two-way multivariate analyses of variance (MANOVAs) indicated that cricketers in the experimental group experienced improved performance consistency and improved performance when using subjective scoring procedures, but only a performance improvement was recorded using objective measures. Subsequent single-case analysis applied to the data of four of the experimental participants also revealed support for the efficacy of the intervention. Conclusions: A mental skill package was seen to be beneficial to enhance performance consistency and actual levels of performance. In view of these findings, practitioners and coaches may wish to consider both objective and subjective scoring measures to improve the sensitivity of performance indicators.