first was after the “rest condition” (CON) and the other two were carried out following a tennis-tournament-type situation with matches played on 2 consecutive days dur- ing which the participants ingested either sports drinks (SPD) or placebos (PLA) (Figure 1). For each of the three conditions, the physical performance tests were performed at 3:00 PM on Sunday and 3 hours after the end of the last tennis match (for SPD and PLA). Each of the three test sessions was performed 2 hours and 30 minutes after a standardized meal. The order for the three conditions was randomized and each was separated by 2 weeks. All trials were performed on the same indoor, hard-surface (Greenset®) courts. The participants became familiar with the experimental procedures and courts during a training session which took place two weeks before their first test condition. The players were instructed to continue their usual dietary habits, refrain from any changes in food se- lections or exercise during the trial and asked not to con- sume any food supplements or functional foods during the study. From 48 hours before each session, training was not allowed and subjects were asked to refrain from con- suming caffeine (coffee, tea, chocolate, cola), tobacco and alcohol. In order to minimize the influence of previous evaluation tests, the sequence of tests was selected to propose the most fatiguing tests at the end. The orders of testing and recovery times were the same in each condition: isometric handgrip strength, power (jump height), maximal 20-m sprints, repeated-sprint ability, maximal isometric strength and fatigability of knee and elbow extensors.