Former world number one Victoria Azarenka of Belarus advanced to the quarterfinals as her opponent Darya Kasatkina of Russia retired during the first set with the scores at 6-6.
James Rodriguez then put Everton in front, shortly before receiving a hand in the face from West Brom defender Kieran Gibbs, who was sent off for his trouble.
Elsewhere, ninth-seeded Garbine Muguruza of Spain disposed of American Sloane Stephens 6-3, 6-3, and former French Open winner Svetlana Kuznetsova had to fight hard for a 3-6, 7-6 (3), 6-3 win over the U.S.'s Bernarda Pera. Enditem
Arsenal manager Mikel Arteta described Aubameyang as "a superb player with an incredible mentality."
Elsewhere, fourth division Rot-Weiss Essen caused a surprise by knocking out newly-promoted Bundesliga side Arminia Bielefeld thanks to a first-half goal from Simon Engelmann. Enditem
However, under the eccentric tutelage of coach Marcelo Bielsa, Leeds refused to lie down, and equalized in the 12th minute through Jack Harrison after a fine counter-attack.
The battle for the second place remained tight until the final kilometers, as Rio Olympic Games runner-up Cai, representing Team Yunnan, held off a strong challenge from London Olympic champion Chen to finish second in 1:22:03. The 28-year-old Chen of Guangdong trailed nine seconds further behind to take the third place.
20 minutes later, Jaroslav Zeleny got lucky and his shot from the top of the box bounced off a teammate and into Dunajska Streda's net to tie things up for the visitors 1-1.
The result means Rafa Benitez's side are sixth in Group A, three points off the fourth place, while Shanghai Shenhua slip to the fifth position in the group on goal difference. Both teams have chances to advance to the championship group for the second stage of Chinese Super League with five games remaining.
Bayern chairman Karl-Heinz Rummenigge sees BVB as being the club's most dangerous rivals this season. "They have had a much longer break and preparation," the 64-year-old said.
The first half started slowly, but things quickly changed when Argentina's Gonzalo Martinez sent an indirect free-kick with surgical accuracy onto the head of Hamdallah, the Moroccan making no mistake from six yards to put his team ahead at the half-hour mark.