Alexandr Dolgopolov and Jeremy Chardy cruised through the first round of the Sydney International on Tuesday.
Ukraine's Dolgopolov, the eighth seed at the ATP 250 event, breezed past Thomaz Bellucci 6-1 6-4 in just 66 minutes.
Brazilian Bellucci was able to win just 11 return points and was broken three times to suffer a second straight loss to start the year.
French sixth seed Jeremy Chardy also advanced in straight sets, beating Kazakh qualifier and 2015 runner-up Mikhail Kukushkin 6-2 6-3.
The French sixth seed sent down 11 aces and was broken only once in the 63-minute contest.
The only seed to fall was Leonardo Mayer, the Argentine proving no match for Teymuraz Gabashvili in a 6-4 6-3 loss.
A finalist in Chennai, Croatian teenager Borna Coric showed the effects of that run as he went down to Gilles Muller 6-1 6-4.
Coric, who suffered a loss to Stan Wawrinka in the final in India on Sunday, was beaten in just 58 minutes.
Local James Duckworth made the most of his wildcard as he beat lucky loser Inigo Cervantes 6-3 6-2, while Nicolas Mahut overcame Adrian Mannarino 6-4 7-5.