You will be given a definition of a task first, then some input of the task.
In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].

Standing between Andy Murray and his first grass court final since Wimbledon on Saturday is Viktor Troicki, and there will not be too much love lost. The Serbian was banned for refusing a drugs test in 2013 after losing a match in Monte Carlo, something which led Murray, who has been outspoken on the whole subject, to publicly label him ‘unprofessional’. Now they will meet in the semi-finals of the Aegon Championships after Murray, supported courtside at Queen’s Club by Jose Mourinho, saw off the big-serving challenge of Luxembourg left-hander Gilles Muller 3-6, 7-6, 6-4. Scroll down to video SINGLES SEMI-FINALSGilles Muller shocked Andy Murray by winning the first set 6-3Murray fought back to secure a place in Saturday's semi-finalsThe Scot will face Serbian Viktor Troicki, who beat John IsnerChelsea boss Jose Mourinho was in attendance at the Queen's Club 
 Question:Asked if he had a problem with _ being on tour he said: It’s a difficult situation — you have to be aware of what exactly the rules are.’
Output:
Viktor Troicki