The giants of the ancient Japanese sport will once again command the attention of the nation's sport fans from Sunday when the 15-day summer Grand Sumo Tournament opens at the Kokugikan Arena at Kuramae, Asakusa, Tokyo.
    Heralding the opening of the event, drum-beating processions wended through the streets and by-ways in the Asakusa area Saturday.
    The matches will get under way at 6 a.m. Sunday and 8 a.m. the remaining days of the tourney.