Pink's lead is now 31% combined. With "Mirrors" about to take No.1 from PJ&D on iTunes, it sure looks like that this might just be enough for her to claim her 4th No.1 single.
It will be close but at this stage, with Pink nearing a 30% combined lead over PJ&D it all depends on how many more singles Pink is selling ahead of PJ&D and whether that'll be enough to overturn the 10k deficit that it faces.
Considering that Pink is now 20% ahead of PJ&D combined and increasing all the time, IMO it's safe to say that she can easily make up the 10K deficit within the next 36 hours (barring any last minute boosts for PJ&D).
I recommend any of the following singles:
Dee-Lite - Groove Is In The Heart
Coldplay - In My Place
Right Said Fred - I'm Too Sexy
Jan Hammer - Crockett's Theme
Ultravox - Vienna
Bobby McFerrin - Dont Worry, Be Happy
Blur - Song 2