Nick Kyrgios (19) took the court twice beating world number 55 Denis Istomin 6-4 7-5 6-4 last Friday in the opening match.
The Canberra teenager then played world number 736 Sanjar Fayziev in a dead rubber on Sunday, winning 6-1 6-1 in 39 minutes.
Despite venting his frustration about the quality of the show court during his first match, Kyrgios refused to comment further after the game, instead saying, ‘I got the job done’.
Lleyton Hewitt got Australia to a 2-0 lead on day one beating Farrukh Dustov 6-4 6-4 6-2 and combined with Chris Guccione in the doubles on Saturday defeating Istomin and Dustov 6-3 7-6(5) 6-2.
The Australians did not drop their serve during their sixth win as a Davis Cup duo.
‘We are complete opposite game styles, personalities, everything, in a lot of ways, but we team up really well though and we know what we’re going to get from one another on the court,’ Hewitt said.
‘We don’t play a lot of doubles together, but I feel in these one-off matches we gel pretty well.’
Ranked 6th in Australia, Sam Groth took 63 minutes to overcome Uzbekistan’s 6-3 6-2 in a dead rubber on Sunday.
Australia was forced to fight its way in to the world group for 2015 after losing to cup contenders France in the opening round of the Davis Cup this year.
See a photo gallery of the Davis Cup action at www.inmycommunity.com.au.