Yuvraj Singh
Yuvraj Singh will be keen for a big knock against AustraliaBCCI

India head into the sixth one-day international against Australia in Nagpur, knowing nothing but a win will do if they are to keep the series alive.

There have been several reasons behind why the series has been so closely-fought and probably why Australia just about edge it, but then a fresh day brings a lot of new possibilities with it and here are five key factors that will decide the sixth ODI on Wednesday.

Mitchell Johnson and the Indian batsmen: So far India have struggled to negotiate the pace of the fiery left-arm pacer and if Johnson rattles India's cage again, then the hosts could find themselves in trouble.

Much will depend on if the openers - Rohit Sharma and Shikhar Dhawan -- can give India a good start and see off the initial threat of Johnson, even if the Aussie can be a threat in the middle part of the innings as well. If India can gain the momentum at the top, then Johnson's confidence will be shaken a little.

Suresh Raina and Yuvraj Singh: The two elegant left-handers have not hit the heights yet in this ODI series - even if their chances have been limited. But as they say cometh the hour, cometh the man, and these two men need to show their prowess in Nagpur, if and when called for.

India will of course, be hoping the openers and Virat Kohli do the bulk of the work, like they did in Jaipur, but the top three also need to have faith that their middle order can do the job when necessary, and that does not mean leaving everything to that magic man MS Dhoni to pull India out of trouble.

New ball and death bowling: Mohammed Shami showed he can make the ball talk up front, and skipper Dhoni will expect more of the same from his opening bowlers yet again. However, as Ishant Sharma's largesse showed, all the good work at the top can be undone with a couple of poor overs towards the end, and India will want to especially keep a close eye on their performances from over 40 to 50.

Spinners: R Ashwin has been a shadow of the new-age bowler that has sparkled so much for India, especially in the limited-overs, while Ravindra Jadeja has not been as effective as he was in the Champions Trophy, when India won the title.

The two new balls is certainly not helping matters, but both of India's spinners need to come to the fore in the middle overs and keep a tight leash on the Aussie batsmen - not just by restricting them, but also by picking up wickets.

From the visitors' point of view, Xavier Doherty has done pretty much as well as can be expected - but that doesn't mean George Bailey will say no to a couple more wickets from the left-arm spinner.

Toss: The two teams so far have looked extremely comfortable chasing. With dew likely to again play a factor, both Dhoni and Bailey will be keen to win the toss and bowl first. With the new rules as well, any target, even one well beyond 300, as India showed in the second one-dayer, is well within reach.