Opener Lokesh Rahul's fastest fifty in the Indian Premier League (IPL) history and Karun Nair's explosive fifty helped Kings XI Punjab beat Delhi Daredevils by six wickets in the second match here on Sunday. Chasing modest target 167, Rahul slamming 50 of just 14 balls, gave a flying start to his team before being dismissed for 51 in the fourth over. Yuvraj Singh also joined the party and hit a couple of boundaries but could not continue for long as he was dismissed by Chris Morris in the 10th over. Earlier, put in to bat, Delhi Daredevils posted 166/7 with newly-appointed skipper Gautam Gambhir (55) scoring handsomely for the team. Apart from him, wicketkeeper-batsman Rishabh Pant and all-rounder Morris also contributed to the cause.