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Video - Women's football highlights
Melissa Wiik's second goal in as many games booked a quarter-final place for the Norway women's football team after they beat New Zealand 1-0 in Group G.
Wiik headed home after eight minutes off an inch-perfect cross from Leni Larsen Kaurin on the right wing.
The Norwegians have now taken maximum points from two matches and set a new record of six games unbeaten at the women's Olympic football tournament.
The Kiwis will now need a win over USA in their final group game to progress.
Elsewhere in the group theUSA got their bid for a fourth consecutive gold medal back on track with a 1-0 win over Japan in Qinhuangdao.
Carli Lloyd's thunderbolt from the edge of the area put the USA ahead on 26 minutes to help her side bounce back from their opening defeat to Norway.
Both Christie Rampone and Ami Rodriguez missed good chances to extend the lead further in the second half.
Japan's best effort came when Yuki Nagasato hit a long-range shot wide.
USA celebrate Carli Lloyd's winner in their match against Japan
Over 52,000 fans watched in Tianjin as hosts China shared the points after a 1-1 draw against debutants Canada in Group E.
Canada's all-time top scorer Christine Sinclair continued her good form with a calm finish past Yanru Zhang on 34 minutes.
China hit back quickly though when Xu Yuan ran on to a superb pass from Lou Jiahui, rounded Canada keeper Erin McLeod and passed the ball into the net.
Earlier, Sweden dominated their game but could only manage a 1-0 win over Argentina.
Midfielder Nilla Fischer netted after 57 minutes when she headed home Therese Sjogran's free-kick.
With only two spots available for the best third-placed finishers to progress to the quarter-finals, the result means Argentina, who stay bottom with no points accrued, will be hoping for a miracle in their next game against hosts China.
Meanwhile, world champions Germany also registered their first victory with a 1-0 win over Nigeria's Super Falcons.
The African champions lost despite being the better side for much of the match as they struggled to beat German goalkeeper Nadine Angerer, who was in fine form.
Kerstin Stegemann scored the only goal of the game with 25 minutes remaining to leave the Germans well placed in Group F with one group game remaining.
In the group's other game Brazil went top of table with a 2-1 win over a poor North Korea.
Goalkeeper Myong Hui Jon's poor control from a back pass left Brazil's Daniela with the easiest of finishes to give her side the lead on 15 minutes.
Marta scored Brazil's second goal
The advantage doubled seven minutes later when Marta capped a flowing Brazilian move by stealing in front of the on-rushing Jon before swivelling to fire home.
Ri Un Gyong's tame shot from 25 yards on 82 minutes was North Korea's first effort on target, a fact that exemplified their paucity of chances.
However, with only seconds remaining, Ri Kum Suk capitalised on one of her side's few threatening moves to strike home from 15 yards for a consolation goal.