
An inspired Alex de Minaur has answered his captain's call to pilot Australia into the United Cup quarter-finals with two do-or-die victories in Sydney.
The tournament hosts were staring down the barrel of elimination from the $17 million teams' showpiece after an off-colour Maya Joint suffered a 6-4 6-1 loss to dual grand slam champion Barbora Krejcikova in Tuesday night's opening singles match.