Beating Andy Murray in a Grand Slam quarter-final is something that you should remember for the rest of your career, if not the rest of your life.Well, for Japanese star Kei Nishikori, his victory over the Brit at the US Open last September has already escaped his memory.The world number nine was asked by a British journalist what he remembered from his US Open match last September; Kei beat Murray in five sets 1-6, 6-4, 4-6, 6-1, 7-5. Instead of a trip down memory lane, reliving what is surely one of his best victories, he tells the reporter: “Um, um… actually, I’m very bad with the memories.”This brought a round of laughter from the press conference, and even more so when he added: “I don’t even know if I won or not… I won? Ah OK.”His matter of fact reaction and supposed genuine response has endeared him to the press and the fans' hearts alike.Twitter’s @doublefault28 posted the video of the exchange to which one user said: "Love Kei.”Another made a mock-up poster of psychological thriller, Memento with Kei headlining. The powers of Photoshop.He is now set to face Andy Murray in a re-match of their US Open quarter-final at Roland Garros.Nishikori fought back to beat Fernando Verdasco in the round-of-16.Booking his place alongside Andy Murray in the Roland Garros quarter-final was almost unthinkable for the Japanese star, who lost an embarrassing first set to Fernando Verdasco 0-6, scoring only 13 points in the opening six games. “I lost my mind in the first set,” he said. “After 6-0 down I knew I had to change something.”And change he did, as he won the next three sets 6-4, 6-4, and 6-0, the final one in 22 minutes.You can watch Nishikori's press conference blooper in the video below.

Murray did get the better of Nishikori at the World Tour Finals in London

Despite Kei Nishikori winning in the US Open against Andy Murray, the world number one did beat Nishikori in last November’s World Tour Finals at the O2 Arena in London. 

After losing the first set tie-break 9-11, Murray won straight sets 6-4 and 6-4 to progress to the semi-finals and face Stan Wawrinka.

Interestingly, it was recorded as the longest match at the event since it moved to the O2 in 2009.