New Delhi, Feb. 14 -- A teenage Pakistani tennis player, Zainab Ali Naqvi, died of suspected heart attack after collapsing in her room following a practice session ahead of an ITF junior tournament. The 17-year-old died while being taken to hospital late on Monday night. She was accompanied by her grandmother who sought help after the youngster fainted. "It is very sad because Zainab was a very promising player on the women's circuit and enthusiastically working hard to win the ITF junior competitions," a senior Pakistan Tennis Federation official said. A police official handling the case said doctors declared her dead after she was brought to an Islamabad hospital. "The doctors suspect a heart attack and have termed it as a natural cause o...