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LONDON, ENGLAND - DECEMBER 05:  Andy Murray of Great Britain (R) talks with John McEnroe of the USA (L) during the Tie Break Tens on day four of the Statoil Masters Tennis at the Royal Albert Hall on December 5, 2015 in London, England.  (Photo by Jordan Mansfield/Getty Images)
LONDON, ENGLAND - DECEMBER 05:  Andy Murray of Great Britain (R) talks with John McEnroe of the USA (L) during the Tie Break Tens on day four of the Statoil Masters Tennis at the Royal Albert Hall on December 5, 2015 in London, England.  (Photo by Jordan Mansfield/Getty Images)

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CNN Open Court's Pat Cash takes you to Royal Albert Hall in London where Andy Murray and John McEnroe are putting a new tennis format to the test.

Mac and Murray test a new fun format

CNN Open Court's Pat Cash takes you to Royal Albert Hall in London where Andy Murray and John McEnroe are putting a new tennis format to the test.