he is not injured, he is ill, maybe virus or something like that. he tried to play but...
from the tournament website:
talent, Grigor Dimitrov, was forced to retire in his first round match versus Spaniard Pablo Andujar. Due to illness
, Dimitrov was forced to give up while being down 5-0.
In the second round, Andujar will play the winner of Baghdatis-Benneteau.