This is just the second instance of both teams registering a 50-plus opening stand in an ICC ODI knockout game (World Cup or the Champions Trophy). The first came exactly 29 years ago - March 9, 1996 - in the World Cup semifinal between India and Pakistan in Bengaluru.
This is also the second such instance in the ICC Champions Trophy history; the first featuring New Zealand and Sri Lanka at the Wanderers, Johannesburg in 2009.
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