In Tennis, three-time Grand Slam champion Stanislas Wawrinka will face Viktor Troicki of Serbia for a place in the semi-finals of the Sofia ATP today. Wawrinka clinched just his second win of 2018 yesterday when he defeated Slovak qualifier Martin Klizan 4-6, 6-2, 6-3 to reach the quarter-finals. Wawrinka, who missed six months of the 2017 season to undergo two knee surgeries after Wimbledon.