So it will be a zero. Both scores are definitive.
No, you are missing the point, I think. Stop looking at worlds as a single event. Worlds score is definitive, and it stays at 0.2. The scores will not be rounded until all the events are finished. So your 0.2 points will still count even though it says 0 at the moment on the scoreboard. The results that Doc has posted so far are just updates after each day, and yours will change as soon as you win more.
The people who have scored 1 point so far have won more than one match. Winning just one match is not going to give anybody a point - everybody's scores will be worth 0 for just one win. The idea is to add up the values for all the wins, so your worlds score might help you get 1 point at the end of the leg.
Say you have your worlds win and you win one singles match also and lose everything else, that will give you 0.6 points all together and you will end up with 1 point. If you didn't have that worlds win, you would only end up with 0.4 points, and your final result would be 0.
Now let's say you win Doppio Giallo match in addition to your worlds win, but lose everything else. Doppio Giallo win is worth only 0.2, so you will end up 0.4 points all together, and you are screwed cause that rounds down to 0.
Do I make any sense?
It's too late to try to be clear.
Basically, think of your score against Fiona as 0.2-0 if that helps you (you leading). If nothing changes and neither of you wins anything else, your points will be rounded to 0 and you end up with 0-0.