STUTTGART, GERMANY - JUNE 10: Mikhail Youzhny of Russia returns against Dominic Thiem of Austria during the quarterfinals on day 7 of Mercedes Cup 2016 on June 10, 2016 in Stuttgart, Germany. (Photo by Daniel Kopatsch/Bongarts/Getty Images)
STUTTGART, GERMANY - JUNE 10: Mikhail Youzhny of Russia returns against Dominic Thiem of Austria during the quarterfinals on day 7 of Mercedes Cup 2016 on June 10, 2016 in Stuttgart, Germany. (Photo by Daniel Kopatsch/Bongarts/Getty Images)