Patrick Ah Van scored his second try of the season as Widnes hung on to defeat Bradford 22-18 and remain flying high in the Super League with a second successive win.
The 26-year-old, who played for New Zealand Warriors in the NRL before moving to Europe, scored the last of Widnes' four tries against the Bulls.
And it proved vital as a converted effort from fellow former NRL product Brett Kearney 13 minutes from time set up a nervy finish before the Vikings held on for a 22-18 win.
Widnes were cruising at 16-6 before half-time as Kevin Brown went over twice and Jack Owens once to Bradford's solitary first-half score from Liam Sutcliffe.
Elliot Kear made it 16-12 eight minutes after the restart before Ah Van's effort effectively put the game beyond doubt for fourth-placed Widnes despite Kearney's for the Bulls try in the 67th minute.
Elsewhere on Sunday Josh Hodgson, Omari Caro and Kris Welham were all at the double as Hull KR inflicted a 44-6 defeat on Wakefield -- the trio contributing four of eight tries against the Wildcats.
And in the day's other game, Warrington upset Huddersfield at home as they ran in six tries from six different scorers for a comprehensive 33-14 win.
Five came after the restart as Warrington overturned a 14-4 half-time deficit with Australian Joel Monaghan completing the scoring in the final minute.
On Friday, Nathan Brown's St Helens maintained their perfect record after seven games with a 14-10 win over rivals Leeds.
Tommy Makinson's second-half double to add to a conversion of Anthony Walker's 24th-minute try swung the game in the Saints favour after a tight first half.
Danny McGuire had opened the scoring for the Rhinos after 18 minutes but that, combined with three Kevin Sinfield goals, was not enough to stop St Helens.
Brown sees his Saints sit top with seven wins from seven while towards the bottom Catalan Dragons' poor start continued at Wigan.
It was tight though and the Warriors had Matt Bowen, who ended more than a decade playing for North Queensland in the NRL to head to Europe this season, to thank.
The 32-year-old's last-gasp score, converted by Matty Smith, denied Catalan a draw as the reigning Super League champions edged out a 22-16 win at home.
Bowen scored Wigan's first try just after the half hour but they were 16-4 behind until Josh Charnley went over in the 53rd minute followed 15 minutes later by Liam Farrell.
Both were converted by Smith to pull Wigan level before Bowen's late effort sealed the win while Jacob Miller was among the scorers in Hull FC's 30-8 defeat of Salford.
Miller scored the first of five Hull tries as Salford lost for the fourth time out of seven this season.
Meanwhile London Broncos' miserable season continues with Justin Carney running in two tries as they fell to a seventh successive loss with a 54-6 defeat to Castleford.