“…In a global sense, GC must be studied extensively, as it is too advanced a stage to meet the needs and preferences of young players (Farrow and Reid, 2010;Schmidhofer et al, 2014;Bayer et al, 2017). Further research might explore which technical-tactical ratios would be ideal at the formative stages for an integral development, whether the competition should create a technical-tactical pattern similar to that used by Association of Tennis Professionals (ATP)/Women's Tennis Association (WTA) players (Torres-Luque et al, 2011;Schmidhofer et al, 2014;Timmerman et al, 2015), or the development of specific technical-tactical ratios for young tennis players (Timmerman et al, 2015;Gonçalves et al, 2016). Finally, longitudinal studies with different samples' characteristics playing in different competition formats are required to discover more scientific evidence in this topic (Gonçalves et al, 2016;Fitzpatrick et al, 2018).…”