Indian boxing star Vijender Singh's much-awaited professional debut in the USA, scheduled for April 12, was postponed after he injured himself during a sparring session in Los Angeles. Vijender, India's first Olympic and world championships medallist in boxing, was to make his US debut at the Staples Center on the Vasiliy Lomachenko-Anthony Crolla undercard. It was to be an eight-round contest and his opponent was yet to be decided.