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Training load (TL) monitoring is considered important to understand an athlete’s ability to perform in training and competition along with their risk of any injury and illness. By assessing the physical work an athlete performs in training (i.e., external TL) and/or the athlete’s response to that training (i.e., internal TL), a basic model of an athlete’s response to training can be estimated by the difference between chronic “fitness” (positive) and acute “fatigue” (negative) functions. Subjective measures of TL, which includes sessional ratings of perceived exertion (sRPE), and differential ratings of perceived exertion, are both considered measures of internal TL. Of these, sRPE is the most common, is recommended as the primary TL measure in team sports, is also widely used in endurance-based sports and is the principal focus of this thesis. When examining relationships between sRPE-TL with performance, there has been very little research in this area but there does appear to be some level of relationship in both open (OS) and closed skill (CS) sports. The difference between OS and CS sports is of interest as research suggests that any TL relationship with performance may be influenced by mental fatigue and mental fatigue experienced by athletes may differ between OS and CS sports. To date, the research investigating TL and the relationship to performance has been focused on sports that are relatively similar in terms of skill nature and mental fatigue. There exists a gap in the literature examining sRPE-TL relationship with performance, if this relationship exists across OS and CS sports and how mental fatigue may influence sRPE-TL. Alongside this, there are also issues with how TL measures are calculated and how subjective TL measures relate to other objective markers of athlete readiness (e.g., heart rate variability). Therefore, the central aim of this thesis was to examine the relationship between TL and performance in different OS and CS sports and to deter