Five facts for Saturday, day 13 at the US Open:

Five facts for Saturday, day 13 at the US Open:

- World number one Novak Djokovic is appearing in his eighth straight US Open semi-final and he`s trying to advance to his fifth straight final and sixth overall (one title, four defeats).

- Djokovic is appearing in his 17th major semi-final and looking to advance to his third Grand Slam final of the season (runner-up French Open; champion at Wimbledon) and 15th of his career (7-7).

- His opponent, 24-year-old Kei Nishikori is first Japanese man to reach the semi-finals at the US Championships since Ichiya Kumagae in 1918. The last Japanese semi-finalist in a Grand Slam event was Jiro Satoh at Wimbledon in 1933. Nishikori is attempting to become the first Asian man to reach a Grand Slam final.

- In the second semi-final, five-time champion Roger Federer brings a 5-0 career record against Marin Cilic, who is the first Croatian to reach the US Open semi-final since coach Goran Ivanisevic in 1996.

- Federer, 33, is the oldest US Open semi-finaist since Andre Agassi (35) who reached the final in 2005 and is appearing in his ninth US Open semi-final and 36th major overall, trying to reach his seventh US Open final (5-1).

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