An embarrassing batting display saw Royal Challengers Bangalore sink to the third-lowest Indian Premier League total in history, as strugglers Rajasthan Royals secured a barely believable six-wicket triumph in Abu Dhabi.

RCB's all-star top order malfunctioned in jaw-dropping fashion during the first of a double-header at Sheikh Zayed Cricket Stadium, staggering to 70 all out following an amateurish start in which they fell to 5-4 by the end of the third over.

The rancid batting continued during Rajasthan's reply, before skipper Shane Watson hit a well-paced 24 to help guide the franchise to a second victory of a fitful season with seven overs to spare.

Vettori's men had been all back in the pavilion by end of the 15th, as leading men Virat Kohli, Yuvraj Singh and AB de Villiers all went cheaply.

It was not plain sailing for Rajasthan in reply, despite reaching 28-0 by the end of the fourth.

It took the emergence of Watson to use his experience to help set the platform for an uplifting victory in remarkable circumstances.