Olympic test nears after Aussie 7s wins

It's so far so good for Australia's men's rugby sevens Olympic quest following a set of comfortable wins to open their Oceania Sevens campaign in Fiji.

Australia beat Vanuatu 52-7 and backed up with a 59-0 defeat of Nauru later in the day.

Fringe Wallabies back Jack Maddocks was impressive in his official Australian sevens debut, while fellow debutant Josh Turner jagged a hat-trick in the second game.

Tougher tests await though, with Tonga the main threat on Friday before a likely Olympic play-off against Samoa - if they both top their pools as expected - on Saturday.

Australia missed their first chance to secure another Olympic appearance at last season's world series, finishing well outside the automatic qualification zone in seventh.

If Tim Walsh's squad fail to nail a quota spot in Suva, Australia must rely on qualifying in a last-ditch tournament on Games eve.

Walsh hopes to avoid that scenario and was happy to see a defensive improvement as Thursday progressed.

"We know that defence is going to win you championships and I thought we tidied that up quite well," he told rugby.com.au.

"You are expected to cruise through today but it's how you cruise through and I thought we finished off really well, so I was pretty happy with that last game."