Max Pearson presents a collection of the week’s Sporting Witness and Witness History programmes. We hear about the half-clay, half-grass exhibition match between Rafael Nadal and Roger Federer. Then, we look back through the archives to find out how Greece held a referendum to decide the country’s future. Next, a mountain massacre on the Himalayas in Pakistan. Plus, India’s coal-mine rescue.And, how a mother successfully campaigned to change her child’s gender on official documents in Argentina. Contributors:Pablo del Campo – creative entrepreneur and tennis fan. Fiona Skillen – Professor of Sports History at Glasgow Caledonian University.BBC Archives.Aleksandra Dzik – Polish mountaineer. Sarpreet Singh Gill – Jaswant Singh Gill’s son.Gabriela Mansilla – Luana’s mother.(Photo: 'The Battle of the Surfaces' at The Palma Arena on May 2, 2007 in Mallorca. Credit: Clive Brunskill/Getty Images)