Chennai Super Kings defeated Pune Warriors by eight wickets in the IPL cricket match at Dr DY Patil Sports Academy in Mumbai on Wednesday.Electing to bat after winning the toss, Pune Warriors set a victory target of 142 runs as they had finished with 141 for Six in their 20 overs. Skipper Yuvraj Singh was the top-scorer with an unbeaten 62.The Chennai team overhauled the victory target by making 145 for two in 19.3 overs. S. Badrinath top-scored with an unbeaten 63, while Suresh Raina was not out on 34. In Wednesday's other IPL encounter, Kochi Tuskers Kerala have elected to field after winning the toss against Deccan Chargers at the Nehru Stadium in Kochi.