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Ben Stokes top-scored with 89 while Jofra Archer picked three wickets in a dominating display at the Oval.
Even a defeat may not spell the end of either team's chances of emerging as one of the top four from the 10-team round-robin phase.
It took England 44 years in their own backyard to lift the sport's biggest prize albeit by the finest of margins as the Super Over also ended in a tie.
The recent ICC World Cup witnessed many heroic batting performances.
Back-to-back defeats by Sri Lanka and Australia had jeopardised England's semifinal prospects, but Morgan's men bounced back in style, ending India's unbeaten run in Birmingham and then crushing New Zealand to storm into the last four.
England breached the 224-run target set by Australia with 8 wickets in hand and 18 overs to spare.
Twenty three years after Arjuna Ranatunga's rag-tag Sri Lankan side clinched the title in Lahore, Lord's will anoint new 50-over world champions after Australia and India, who shared the last five titles between them, wilted in the semifinals.
The England skipper does not expect Sunday's final to be a high-scoring contest and feels the likes of Trent Boult and Matt Henry could prove quite a handful for his batsmen.
During their World Cup match on Friday, Morgan left the field in the 41st over of West Indian innings, joining Roy on the treatment table, who had earlier hobbled off with a hamstring strain.
The England captain scored more than a hundred runs off sixes alone, and only hit four fours in his innings.
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