In psychology, the ability to manage one’s thoughts, emotions, and behaviors in the face of adversity is known as “mental toughness” [3]. Research in tennis players has shown that mental toughness is positively linked to resilience and negatively linked to stress [4]. It is important here to point out that the oftentimes labeled “negative emotions” such as anger can be the fuel for better performances, but considering that a Men’s tennis match typically lasts for 2 hours and 45 minutes and a Women’s tennis match for 1 hour and 20 minutes [5], it is important to remember that these emotions can use up a lot of mental energy very quickly, if not channeled the right way. In research, the impairment due to mental fatigue has been linked to significantly reduced accuracy in second serves [6]. Every player is of course different, but for some individuals it is likely that maintaining the focus on being in the moment, rather than fixating only negative emotions can help to conserve energy and enhance performance.