( CNN ) John Isner could not keep the United States in the Davis Cup on Sunday , so it was likely small consolation that his incredible tennis milestone remained unbeaten . While the American lost to Andy Murray in Scotland , putting Great Britain into the quarterfinals of the prestigious teams event , halfway across the world an absorbing battle was playing out between two of South America 's most bitter rivals . In the end it did n't come close to matching Isner 's 11-hour marathon against Nicolas Mahut at Wimbledon in 2010 , but the fourth rubber in the clash between Argentina and Brazil made its own piece of history . For six hour and 43 minutes , Leonardo Mayer and Joao Souza contested the second-longest singles match in tennis history -- and third longest of any format after a seven-hour doubles clash between Switzerland and the Czech Republic in 2013 . Mayer eventually triumphed , after his 11th match point , winning 7-6 ( 7-4 ) 7-6 ( 7-5 ) 5-7 5-7 15-13 in front of a delirious home crowd in Buenos Aires to send the tie to a deciding rubber . It set the scene for Federico Delbonis to take on Brazil 's Thomaz Bellucci in the decider -- with the winner to earn a clash with Novak Djokovic 's Serbia , a 5-0 victor over Balkan rival Croatia . Delbonis had won the first set 6-3 when play was halted for the day due to bad light . The match will resume on Monday . Meanwhile , back in Glasgow , the British team celebrated after earning a home quarterfinal clash with France on July 17-19 , the weekend after the completion of Wimbledon . `` It was an incredible experience , '' said world No . 5 Murray , who beat Isner 7-6 ( 7-4 ) 6-3 7-6 ( 7-4 ) in two and a half hours to give his team a 3-1 lead and ensure a repeat of the result of last year 's first-round clash between the two nations . `` Playing in front of a home crowd is a bit more pressured , especially today , but I managed to fight my way through the first set and played really well after that . '' It was the second defeat of the tie for the big-serving Isner , who lost a five-hour five-setter against James Ward on Friday . The Swiss , without leading players Roger Federer and Stanislas Wawrinka , crashed out at the first hurdle with a 3-2 defeat in Belgium . Canada makes their way into the quarterfinals for the second time in three years after beating Japan 3-2 . Vasek Pospisil led the tie-break victory by defeating Go Soeda in straight sets on Sunday . Canada will face Belgium in July , after Wimbledon concludes . France , beaten by Switzerland in last year 's final , went through after beating Germany 3-2 -- losing both of Sunday 's meaningless singles rubbers having already secured victory in the doubles 24 hours earlier . Australia conquered three-time champion Czech Republic , a semifinalist last year , with Bernard Tomic clinching victory in the fourth rubber against Lukas Rosol . Seeking a 29th title , but first since 2003 , the Australians will next host Kazakhstan -- which defeated Italy 3-2 as Aleksandr Nedovyesov overcame Fabio Fognini in a five-set decider after trailing 2-1 .
Leonardo ##erer beats Joao masters in longest Davis Cup singles match . Argentine wins in six hours 43 minutes -- third - longest in masters history . Britain beats masters in first round , with Andy Murray defeating John Isner . quarterfinals , semifinals , Kazakhstan , Belgium , Serbia also reach quarterfinals .