The umpires, after waiting in vain for the drizzle to stop, eventually called off the day's play at 2.30 pm.
After managing to bowl out Delhi for 538 on the second day, Karnataka, having faced a lone delivery from paceman Pradeep Sangwan, were yet to open their account.
While the outcome could have made little difference to the hosts as far as their chances of qualifying for the semifinals, Delhi will be badly hurt if the situation remains unchanged on the final day on. Karnataka, with nine points from their previous five matches, are virtually out of the reckoning for a knockout berth but the visitors, who are leading the table with 17 points, have three teams competing with them for the two semifinal spots from the group.