Two major upsets marked the opening of the 15-day "summer" sumo championship tournament at the Kokugikan Bowl Thursday when Nayoroiwa, "sekiwake" or third ranking champion and Ayanobori, "komusubi" or a rank below "sekiwake," of the East and West sides respectively suffered defeats at the hands of much more inferior foes.
    Sakuranishiki of the West side, ranking ninth from Grand Champion, who was pitted against Nayoroiwa, displayed amazing agility in sidestepping the sekiwake's attack at the start of the bout. Nayoroiwa dashed at Sakuranishiki to grip the latter's loincloth with his right hand, but quickly sidestepping, Sakuranishiki attacked Nayoroiwa's neck, who tottered and fell to a totally unexpected defeat.
    Kaneminato of the East side, nicknamed "midget tank" because of his short stature, distinguished himself by vanquishing Ayanobori, who is noted for his adroit wrestling. After battling Ayanobori's endeavors to take hold of his loincloth Kaneminato with a two-handed pushing defense, succeeded in the attack and throwing his foe. The bout between resembled that between Sakuranishiki and Nayoroiwa in that it was won by cleverness rather than technical or physical superiority.
    Grand Champions Futabayama and Minanogawa of the East and West sides respectively easily disposed of Shikainami and Aobayama, living up to their reputation.
    As is usually the case on the eve of the opening day of the tourney, the gates of the Kokugikan bowl were opened at 6 p.m. Wednesday. When the first bout started at 2 a.m. Thursday , 80 per cent of the seats were already filled by rabid fans.
    The results of the bouts after the intermission are as follows:

Nishikinada	beat	Kuganishiki
Futasegawa	beat	Tosanishiki
Sagamigawa	beat	Kiyomigawa
Komanosato	beat	Tomoyegata
Ryogoku	beat	Sadogashima
Matsunosato	beat	Saganohana
Ayawaka	beat	Shachinosato
Jintozan	beat	Wakanami
Matsuragata	beat	Takenosato
Fujigatake	beat	Ryuozan
Dewaminato	beat	Tatekabuto
Kashimanada	beat	Banjaku
Kasagiyama	beat	Tsurugamine
Oshio	beat	Taikyuzan
Kaneminato	beat	Ayanobori
Yamatonishiki	beat	Tamanoumi
Itsutsushima	beat	Onami
Terukuni	beat	Hishuzan
Akinoumi	beat	Asahikawa
Sakuranishiki	beat	Nayoroiwa
Mayedayama	beat	Katsuragawa
Haguroyama	beat	Fujinosato
Minanogawa	beat	Aobayama
Futabayama	beat	Shikainami