It didn't show in Djokovic's play, though, as he embarked upon another swing of four games in succession, holding Nishikori to three points in his next two service sets as he soared into a 4-1 lead.
Fifth seed Juan Martin del Potro met stubborn resistance from Frenchman Gilles Simon and had to settle for a suspension of their Wimbledon fourth round match as he led 7-6 (1) 7-6 (5) 5-7 after more than three hours on Court Two on Monday.
Federer had a match point in the third set at 4-5, 30-40 but failed to take it, before Anderson broke in the following game to earn the opportunity to serve out the set.
Yet the 22-year-old, playing in the last 16 for the second successive grand slam, saw his hopes severely hindered by mistakes and a sliced forehand wide gave Djokovic a pair of break points - only one of which he needed.
It nearly looked like Djokovic ended up giving Nishikori the point on the ensuing backhand, because when you've earned it you've earned it. Djokovic has been looking like his old self again this Wimbledon, but you have to think there's a voice in the back of his head wondering why this keeps happening to him. It's a big chance for me to face Rafa. "But he played a great three points", said Nishikori.
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Casey, which upheld large parts of Roe and ruled that states can not impose an "undue burden" on patients seeking abortion. If not for that alliance, Nixon said, Democrats could have been in power and the measure already would have become law.
"After that he was playing better".
"I think the first warning was unnecessary", said Djokovic, who was sanctioned in the second set for spearing his racquet into the court.
"It didn't harm the grass".
Maybe last year he suffered from a slight dip in motivation, which I also think is completely normal because of what he'd achieved the previous year - winning all four Slams in a row. "He even threw the racket in the fourth set and the umpire said he didn't see him so I get the warning, he doesn't", added the Serb.
The 12-time Grand Slam champion then raised his level in the fourth set and finished with a victor into the corner to book his place in Friday's semi-finals where he was joined by a familiar foe as Nadal won through late in the day. "So hopefully I can keep going".