Great Britain began the inaugural ATP Cup with an agonising 2-1 defeat against Bulgaria in Sydney, but there was better news for Australia and Canada on day one.
Doubles pair Jamie Murray and Joe Salisbury needed to win their match against Grigor Dimitrov and Alexandar Lazarov to secure overall victory, with the match not being completed until the early hours of the morning.
But after the first two sets were shared following tie-breaks – 7-6 (7-5) 6-7 (2-7) – it then came down to a match tie-break that the Bulgarian pair took 11-9 in the early hours of the morning in Australia.
The match went down to the final rubber after British number one Dan Evans surrendered a one-set lead to lose 2-6 6-4 6-1 to US Open semi-finalist Dimitrov in the second singles match.
Cameron Norrie had given his country the perfect start by overcoming world number 423 Dimitar Kuzmanov 6-2 3-6 6-2.
The new 24-nation tournament features six groups of four teams. Each country plays three round-robin ties which are comprised of two singles matches and one doubles.
In the other Group C match, a Belgium team comprised of Steve Darcis, David Goffin and doubles pair Sander Gille and Joran Vliegen defeated Moldova 3-0.
Tournament organisers apologised to Moldova after mistakenly playing the Romanian national anthem before the match.
Hosts Australia enjoyed a successful start by whitewashing Germany 3-0.
Nick Kyrgios and Alex De Minaur each won singles matches to give their team an unassailable lead, defeating Jan Lennard-Struff and world number seven Alexander Zverev respectively.
Canada won the other G encounter at the Pat Rafter Arena in Brisbane, beating Greece 3-0. World number 15 Denis Shapovalov defeated world number six Stefanos Tsitsipas 7-6 (8-6) 7-6 (7-4) in that match.
In the Group D matches played at the RAC Arena in Perth, the United States were beaten 2-1 by Norway, while Russia defeated Italy 3-0.
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