This could be Collingwood's last test innings after an atrocious series with the bat.
The first hour of this day could very well decide the result of this test match and wether the series will finish 2-2 or 3-1 to England.
Assuming night-watchman James Anderson gets out early then England need to survive it with no more wickets down and they can begin to push on. But if Australia get early wickets they will be very much in control of the game, especially considering the spin we're likely to see on day 4 and 5.
It's a big innings for next man in Paul Collingwood. Averaging a poor 15 this series with only 70 runs, he is in desperate need of runs to silence the doubters.
Alistair Cook will be hoping to push on and get a hundred to continue his fine series while Australia will be hoping for some reverse swing with the new ball still 32 overs away.
England's aim should be to get ahead after lunch and go on to get a lead of 80 plus.
The weather is good for the whole day so there shouldn't be any interruptions and I look forward to another fascinating day of Ashes action.