NEW DELHI, April 19 : Chennai Super Kings' patchy Indian Premier League (IPL) campaign suffered a fresh blow after their teenaged batter Ayush Mhatre tore his hamstring, an injury that could put him on the sidelines for a long spell. The 18-year-old has been the most prolific batter for five-time champions Chennai, who dropped to seventh place in the 10-team league after Saturday's defeat by Sunrisers Hyderabad. The top-order batter milked 30 off 12 balls but was seen clutching his hamstring