(Reuters) -Davis Cup heavyweights Australia and the United States eased through the first qualifying round on Saturday but Britain were knocked out as Japan hit back from 2-1 down to win 3-2, while Denmark staged a dramatic comeback to overcome Serbia.

Japan fought back from 2-1 down to beat Britain 3-2 in their Davis Cup qualifier to advance to the second round, while the United States sealed a 4-0 victory over Taiwan.

World No.8 de Minaur, in his first outing since his Australian Open quarter-final drubbing by Jannik Sinner, had to subdue comeback man Mikael Ymer before running away to a 7-5 6-1 victory on Friday (Saturday AEDT).

France and Spain both won their doubles rubbers to ease through the first qualifying round of the Davis Cup on Sunday, while Canada need to overturn a 2-0 deficit to progress.