Definition: 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].
Input: It was a job for a code-breaker as much as a reporter. But I did my best by turning the binoculars on the familiar, full figure of Boris Becker sitting in the players’ box. We suspicious types in the press seats were focusing on the triple Wimbledon winner to see if he was conveying any semaphoric coaching advice to the defending champion, Novak Djokovic. What, for example, were we to make of Becker ruffling his hair with his left hand? What did fiddling with his wedding ring mean? Such thoughts taxed us in light of Becker’s pre-Wimbledon admission that he and Djokovic have ‘ways of communicating’ mid-match. This sort of chatter contravenes the laws of tennis, but is hardly cheating of the first order. Taking tetrahydrogestrinone, it is not.Novak Djokovic moved into the second round of Wimbledon on MondayWorld No 1 beat Philipp Kohlschreiber in straight sets on Centre CourtDojokovic edged out opponent 6-4, 6-4, 6-4 to book his place in round twoWimbledon 2015 live! Follow the action here as it happens 
 Question:Yes, _ appeared a little short of his best (though he denied he was rusty).

Novak Djokovic