Hobart TAS, Australia, 15 January 2015 | AAP

Australia’s Casey Dellacqua faces a gruelling day of tennis at the Hobart International in which she could move into the semi-finals or be cast aside as a round-two loser.

They are the best and worst-case scenarios for Dellacqua on the fifth day of a tournament where rain delays have forced rescheduling which could see result in the tournament’s top seeds play twice in the space of hours.

World No.29 Dellacqua was to play Italy’s Karin Knapp on Wednesday but heavy rain meant not a single point was started.

Instead the match has been shifted to Thursday, with the winner progressing to the quarter-final, due to be played in the evening.

The victor should also find success in their quarter-final match, with the opponent to be decided earlier on Thursday between qualifiers Kateryna Kozlova of the Ukraine and Amercia’s Madison Brengle.

Also on court on Thursday is British contender Heather Watson, taking on Italy’s Roberta Vinci.

World No.49 Watson has found good form in Hobart, taking out America’s Sloane Stephens in straight sets in the second round.

There is no rain forecast for Hobart on Thursday.