Adelaide United beat bitter rivals Melbourne Victory 4-2 and ensured former cult hero Marcos Flores' return to Hindmarsh Stadium was one to forget in a hostile and thrilling encounter.
Seongnam Chunma kick-started their campaign with a 5-0 rout of Central Coast Mariners, while Adelaide United and Bunyodkor also won, as did Al Rayyan, Lekhwiya and Saudi Arabia's Al Ahli in the west.
FIFA.com previews the midweek AFC Champions League action as the group stage reaches its halfway point with some of the continent's elite, among them Gamba Osaka and Jeonbuk Motors, seeking to find form and keep their hopes alive.
FIFA.com previews the second AFC Champions League matchday where the spotlight will fall on a number of the continent's elite aiming to overturn shock opening defeats.
Wellington Phoenix recovered from an early deficit to beat lowly Adelaide United 2-1 and continue their good recent form as they seek to close the gap on runaway A-League leaders Central Coast Mariners.
Central Coast Mariners' 3-2 comeback victory over Adelaide United, coupled with Brisbane Roar's 1-1 draw at Melbourne Heart, means the former now have an 11-point lead at the top of the A-League.