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Asked to bat first, RCB were 31 for no loss with Virat Kohli (19 not out) and Faf du Plessis (12 not out) in the middle, when a drizzle halted play before it turned into a downpour.
There has been a forecast of heavy rain across the city.
The match is vital for both sides as they vie for the final available berth in the playoffs. A washout or a win for the visitors will see them through.