Talent identification during puberty by Piotr Unierzyski. Piotr has been working at the University of Physical Education in Poznan for 30 years whilst at the same time has coached and worked with players of all levels; from beginners to professionals. Taken from the 2011 ITF Worldwide Coaches Conference in Egypt, Piotr discusses research on maturity and performance in tennis and also covers the implications for talent identification.