Bairstow and Roy have recorded three successive century stands in the tournament and the foundation they lay at the start of an innings is critical to England's success.
On the contrary, New Zealand have looked a shadow of themselves and have lost momentum towards the business end of the tournament, when it matters the most.
The round-robin league stage of the ICC World Cup 2019 went down to the wire to decide the top two positions.
Now team India's will be playing semi-final with New Zealand at Old Trafford on 9th July and if India wins then the will play final on 14th July at Lords.
It may be that England's World Cup campaign could come down to the toss of a coin.
The twice champions won their last World Cup meeting against New Zealand at Centurion in 2003 but more pertinently are the only side to have been defeated only once in nine matches at the quadrennial showpiece this year.
Morgan, who suffered concussion when he was struck on the helmet by Starc at Old Trafford four years ago, was accused of being scared of the fast bowler by his former team-mate Kevin Pietersen during Australia's group stage victory over England.
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"We´re batting first because it looks a good wicket and the nature of our team means we´re playing a second spinner", said Du Plessis.
Jennings has averaged 25.19 runs in his 17 Test matches with two hundreds. You can't always choose your opponent and will have to be ready for any team in the semi-final.
After a comprehensive loss to England at Edgbaston in one of their group matches, India would rather not like to face England in the semi-finals and hence this match against Sri Lanka becomes very important for them.
Australia lost captain Aaron Finch (3) in the third over of their reply and were in further trouble when Khawaja hobbled off with the score on 20.
The short ball has worked a fair bit to a lot of people at this World Cup and we'll have to see if we can get Eoin out one way or another again'.
On paper the Black Caps appear to be the weakest of the teams that have made it through to the last four.
After winning the toss, South Africa chose to bat first.
Rohit was eventually dismissed for 103, having added 189 runs for the first wicket with KL Rahul, which in itself is a record opening partnership for India at the World Cup.