Collector M. Veerabrahmaiah declared open the National Tennis Championship for veterans, being organised by the City Club here on Wednesday. The matches will be held on the club premises, Officers' Club and PTC Tennis Court till March 13. Some 150 participants from Andhra Pradesh, Odissa, Maharashtra, Tamil Nadu and Karnataka are participating in the tournament. The prize money is Rs. 1 lakh. S.K. Rednam, veteran tennis player from the State, would be felicitated on the concluding day of the tournament.