Emotions will run high when India take on arch rival Pakistan in the hockey World Cup begining at Major Dhayan Chand Stadium in New Delhi tonight at 8.30 p.m. Heavy security are in place for the two-week long mega sports event.In other matches of the inaugural day, Spain take on South Africa in the opener which is underway, followed by the match between Australia and England which starts at 6.30 p.m. this evening.