A whirlwind 50 by tailender Shane Harwood could not stop Tasmania maintaining its perfect ING Cup record this season by downing Victoria by 43 runs at Bellerive Oval.

Batting at No.10, Harwood smashed an unbeaten 50 off just 31 balls - including five fours and two sixes - but it came too late as Victoria was restricted to 8-255, well short of Tasmania's 5-298.

Harwood put on 75 for the final wicket in just over 10 overs with Andrew McDonald who remained unbeaten on 28.

It marked the third straight win for unbeaten Tasmania which sits on top of the ING Cup table, four points ahead of nearest rival Queensland which has played one less game.

Tigers skipper Dan Marsh cited confidence as a major factor to Tasmania's flying start to the one-day competition.

"We got off to a good start in Perth (in the first game on October 15) and then once you start winning you get belief from that (and) confidence," he said.

"I think one day cricket is just such a confidence game. Once you get on a roll, you feel as though you are unbeatable.

"At the moment, that's the way the feeling is in the camp."

Bushrangers captain Cameron White - who had only returned from a month-long Australian cricket tour of India with Victorian teammate Brad Hodge - wrote off the result as "a bad day".

Victoria narrowly missed out on a one-day final berth last season, finishing third behind Western Australia and champions Queensland.

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