KB Arun Karthik turned out to be an unlikely hero hitting a stunning six off the last delivery of the match to power Royal Challengers Bangalore to the semi-final
RCB joins Mumbai Indians, New South Wales Blues and Somerset in the last four.
The Redbacks had scored a commanding 214 for two in 20 overs, which the RCB chased down with two wickets in hand.
With six needed of the last delivery, Daniel Christian bowled a slower one just outside the off-stump and Karthik who plays Ranji Trophy for Tamil Nadu waited for the delivery and swung it over mid-wicket as Redbacks players looked stunned.
A swashbuckling century by Daniel Harris and a smashing 70 from Callum Ferguson powered South Australia Redbacks to 214 for two in 20 overs. It looked an imposing total but RCB gave a fitting reply courtesy Tillekaratne Dilshan (74, 47 balls) and Virat Kohli (70, 36 balls) who added 100 runs in 8.5 overs before Tait came back to bowl an inspiring second spell.
Aravind swung, and missed. KB Arun Karthik, the non-striker, was already halfway down the pitch. As the two batsmen scampered the bye, keeper Tim Ludeman collected the ball and kept it firm in his gloves, not throwing for fear of conceding overthrows.
Maybe he should have had a shy. Arun Karthik, who bats at number three for Tamil Nadu, had never really had a significant opportunity to display his wares in the IPL. Even here, he had worn an unfamiliar pair of keeping gloves and walked in at the fall of the seventh wicket. Now, he was batting with six needed from one ball.