J-League leaders Yokohama Marinos crashed to a 1-0 defeat to Albirex Niigata for their first loss of the season as they saw their lead reduced to only one point on Saturday.
Substitute forward Hideya Okamoto was the hero of the home team when he stepped aside in the area to beat two defenders in the 78th minute for his first goal of the season.
"Defenders were in front of me, but I calmly dodged them to score. I couldn't score in the league competition so far, so I feel very good now," said a jubilant Okamoto.
"Our defenders kept their attacks at bay from the first half and I really wanted to win the game with my goal," he added.
Yokohama have now six wins against one defeat for 18 points, followed by Omiya Ardija on 17 points, Urawa Red Diamonds on 16 points and defending champions Sanfrecce Hiroshima on 13 points.
Omiya set a new J-League record of 18 games without a defeat by beating Urawa 1-0 thanks to Slovenian striker Zlatan Ljubijankic's only goal in first-half injury time.
Japan international striker Hisato Sato, last year's Player of the Year, interrupted a Jubilo Iwata pass to score a goal in the fifth minute, leading Hiroshima to a 2-0 win.
In other games, Kawasaki Frontale and Shonan Bellmare both gained their first win of the season, beating Vegalta Sendai 4-2 and Oita Trinita 2-1, respectively.
Although Australian international striker Joshua Kennedy put Nagoya Grampus one up, they committed two penalties as FC Tokyo cashed in through Brazilian forward Lucas on their way to a 3-1 win.
Kashiwa Reysol defeated Sagan Tosu 3-0, while seven-time champions Kashima Antlers were held to a goalless draw by Ventforet Kofu. Shimizu S-Pulse drew with Cerezo Osaka 1-1.