Chennai Super Kings and Rajasthan Royals lock horns in the Indian Premier League (IPL) here on October 19 with the knowledge that any more slip-up could dash their slim play-off hopes. Both CSK and RR have failed to live up to the expectations so far and are placed sixth and seventh on the points table in the eight-team competition. The two struggling teams have six points from nine games, but the defending champions are placed above on the net run rate.