Zampa back to bowl his fourth and final over. Hetmyer hammers the second ball straight down the ground for a four.
He slog sweeps the third ball over midwicket for a six before taking one to long-on.
Dubey lofts the fifth ball over long-off for a six to raise the 50-run stand for the sixth wicket from just 22 balls.
He swings the last ball through square leg for a boundary, to get 22 from the over.
Royals need 70 from the last two overs for victory.
Dubey has showed great potential with the bat, smashing 32 from nine balls with a four and four sixes.