Shanghai attacked from the outset and their efforts paid off after just 13 minutes when Riascos outpaced defender Lee Yoon-Sup to latch onto Dai Lin's clipped pass before lobbing keeper Liu Jun.

Shanghai doubled their lead five minutes before the break when Liu palmed away Feng Renliang's cross from the right but Vicente leapt higher than Lee to head in the rebound.

The home side intensified their attacking endeavours after the interval but suffered a setback midway through the second-half when Aleksander Rodic received a second yellow card for diving in the Shanghai box.

Two minutes later, Stjepan Jukic was sent off due to a reckless tackle on Vicente.

The game was then suspended for a few minutes as Qingdao coaches and substitutes ran onto the pitch to protest against the decision, while an irate translator for the club confronted referee Wang Zhe.

The game did not resume until police intervened to stop the chaos.

"We played well in the first half and deserved scoring two goals," said Shanghai manager Miroslav Blazevic.

"Our rivals played extremely aggressive football in the second period and their play troubled us."

Elsewhere, Shenzhen Kingway and Dalian Shide played out a goalless draw.