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: After 18 months of coaching Novak Djokovic, Boris Becker has come to understand the essence of what makes the Wimbledon champion increasingly look like one of the greatest players ever. ‘He’s a tough cookie, I’d call him a street fighter. When the going gets tough, he gets better, when he bleeds a little bit he goes forward,’ said Becker, reflecting on his charge’s latest triumph at the All England Club. The 47-year-old German was left having to ‘pinch myself’ at being in the champion’s corner 30 years after he first took Wimbledon by storm. He was purring at Djokovic’s ability to lift his game at the crucial juncture of Sunday’s 7-6, 6-7, 6-4, 6-3 defeat of Roger Federer.Boris Becker describes Novak Djokovic as a 'street fighter' after victoryWorld No 1 Djokovic lifted his third Wimbledon title on SundayOvercame seven-time champion Roger Federer in four sets 7-6, 6-7, 6-4, 6-3Becker helped Djokovic to three Grand Slam titles in 18 months together 
 Question:‘That’s when matches are decided and _ feels it, he smells it, understands it, when you have to go all in.

Novak Djokovic