“…A player's ball velocity and success rate, combined with ball accuracy, are key determinants of his or her stroke quality (Landlinger, Stöggl, Lindinger, Wagner, & Müller, 2012;Strecker et al, 2011;Vergauwen, Madou, & Behets, 2004). The key role of ball velocity in relation to tennis performance is supported by the findings of Ulbricht, Fernandez-Fernandez, Mendez-Villanueva, and Ferrauti (2016), who measured correlations between players' physical qualities and tennis performance.…”