(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.

The United States beat Taiwan 4-0 in Saturday's Davis Cup qualifiers in Taipei City behind the experience of Olympic silver medalists Austin Krajicek and Rajeev Ram.

Jacob Fearnley delivered an impressive Davis Cup debut as he levelled Great Britain ’s tie with Japan after the opening day. With Jack Draper and Cameron Norrie not involved in the first qualification round for the finals, Fearnley was handed his debut as the highest-ranked British player.

Alex Michelsen gave the United States a 2-0 lead over Taiwan on his Davis Cup debut in the first round qualifiers on Friday, while Jacob Fearnley also impressed in his first appearance in the competition to pull Britain level with Japan.

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