New York, Sep 8 (IANS) Men\'s world No.3 Andy Murray has said it was \"tough and disappointing\" to see his run of 18 successive Grand Slam quarter-finals end with the defeat against South Africa\'s Kevin Anderson at the US Open tennis tournament here.

The 15th seed Anderson won their fourth-round match 7-6 (7-5), 6-3, 6-7 (2-7), 7-6 (7-0) in four hours and 18 minutes on Monday.

It is the first time since 2010 that Murray has not reached at least the last eight at a Grand Slam.

â€œThat\'s obviously something that is disappointing to lose. Many years\' work has gone into building that sort of consistency. To lose that is tough,â€ Murray was quoted as saying by bbc.com on Monday.

\"He (Anderson) is an excellent player. It came down to a few points here and there. He served extremely well as he normally does, and that was it,â€ the 28-year-old said.

\"I was down two sets and a break and fought unbelievably hard to get myself back into it. I\'m proud of the way that I fought right the way through to the end,\" Murray said.

Murray will next head to Glasgow, where Britain take on Australia in their first Davis Cup semi-final for 34 years, starting on 18 September.

\"I\'ve done my best in all the tournaments I\'ve played this year. We\'ve had a great run in Davis Cup and that was a huge priority this year, and now being in the semi-finals it\'s a great opportunity for us,\" he said.

\"I have played a lot and when Davis Cup is done, I won\'t play much after it through to the end of the year,\" Murray concluded.

US Open defeat tough, disappointing: Murray