He then got to the quarter finals in Sydney , but was forced to pull out of his match against Viktor Troicki by a lower back injury .
Kohlschreiber began 2017 in Doha , where he lost to Fernando Verdasco in the second round .
Kohlschreiber then got to the quarter finals in Sydney , but was forced to pull out of Kohlschreiber 's match against Viktor Troicki by a lower back injury .
Kohlschreiber began 2017 in Doha , where he lost to Fernando Verdasco in the second round .