Kei Nishikori tied history two nights ago when his round of 16 match against Milos Raonic went until 2:26 am in New York. Nishikori triumphed in the epic battle, winning in five sets 4-6, 7-6, 6-7, 7-5, 6-4. After one full day off, Nishikori was back at it again Wednesday afternoon at his US Open quarterfinal match against Australian Open winner Stan Wawrinka. He defeated Wawrinka in another four-plus hour, five set match, 3-6, 7-5, 7-6, 6-7, 6-4. Nishikori, the tenth seeded player at the tournament, has now defeated two players in the top five: fifth-seeded Raonic and third-seeded Wawrinka. 

Nishikori's previous best Major finish was the quarterfinals of the 2012 Australian Open. His accomplishment in reaching the 2014 US Open semifinals makes him the first Japanese men's tennis player to reach the semifinals of a Major tournament since 1918 - the first in the Open Era. 

Nishikori's coach, Michael Chang, was animated throughout the match. Here is his reaction at match point:

Nishikori will face the victor of tonight's Novak Djokovic/Andy Murray quarterfinal match. Luckily for Nishikori, he will have two days off to recover from his last two matches before the semfinals begin.