The new Petrofac side announced their arrival in Shetland football with a quarter-final victory over Spurs B in the Bloomfield Cup for reserve sides.
The team, which may have ambitions of entering the senior Premier League next season, easily defeated the Milkbags 5-1 at Seafield on Saturday evening.
The other quarter-final matches saw Ness United A/B win 4-1 against Scalloway B at Cunningsburgh, Celtic B defeat Thistle B 5-3 at Gilbertson Park and Whalsay B progress after Yell failed to field a team.
Whalsay B play Ness A/B and Petrofac take on Celtic B in the semi-finals later this month.
G&S Flooring Premier League
Thistle 1, Celtic 2
Calvin Leask scored for the Jags but two from James Aitken gave the Hoops all
Whitedale 4, Whalsay 2
Jamie Wilson hit a hat trick and Lorne McNiven got the other for the West Siders. David Thomson and Ross Irvine scored for Whalsay
Celtic 1, Scalloway 2
James Aitken maintained his good scoring form but a Finn Watt own goal and a Robert Garrick strike gave the village side the three points.
Whalsay 0, Spurs 2
The Milkbags start to close in on the title with another win. This time Jordan Webb and Scott Morrison got the goals.
Whitedale 2, Delting 0
Richard Sinclair got a double as Whitedale start to hit league form.
• For full football round-up and league tables see The Shetland Times on Friday.