It took the Briton Dan Evans only 85 minutes to beat Juan Ignacio Londero 6-2 to 6-4 and reach the second round of Adelaide International.
Evans defeated the Argentine four times and meets Alexander Bublik from Kazakhstan.
British women number two now Heather Watson fought back to beat Jil Teichmann at Hobart International.
The 27-year-old won 1: 6: 6: 4: 6 against the Swiss number 67 and meets Fiona Ferro in the round of 16.
Evans hopes to maintain his impressive form at the Adelaide tournament, where 19-year-old Felix Auger-Aliassime, number 21 in the world rankings, is now the best-placed player.
The draw opened for the British after the withdrawal of the first two seeds Novak Djokovic and Alex de Minaur.
Djokovic withdrew after helping Serbia beat Davis Cup champion Spain in Sunday's first ATP Cup final, while Alex de Minaur had a rib injury.
The 29-year-old Evans was a key member of Britain's squad ahead of the ATP Cup quarter-finals in Sydney and celebrated important victories against Belgian David Goffin and Australian De Minaur.
British world number 42, who scored his first Grand Slam at the Australian Open in Melbourne, is half the draw in Auger-Aliassimes, but would only meet him in the semi-finals.
Elsewhere Evans & # 39; ATP Cup teammate Cameron Norrie lost 7: 6: 6: 2 to Brazilian qualifier Thiago Monteiro in the second round of the ASB Classic in Auckland.