"All his shots just started to be much more hard, powerful and more aggressive," Kukushkin said. "It was like a different player."
Wimbledon 2014: Serena Williams out early again in Slam →
He did admit, though, that he's still getting used to sitting at the top of the pack after a standout 2011 in which he won three of the four majors and overtook Nadal and Federer for the No. 1 ranking.
Hewitt ruins perfect record of top 3 in Melbourne →