Both sides started highly motivated as Leverkusen took over, whereas Wolfsburg focused on turnovers and fast breaks. However, both teams lacked in accuracy.
Spain's 12-time French Open winner Nadal, who is bidding for a record-equaling 20th Grand Slam, will play world No. 83 Egor Gerasimov of Belarus in the first round.
Adrian scored his second and third in the 72nd minute and in stoppage time respectively, helping Chongqing to seal the victory.
Napoli also got their new season off to a good start as the Coppa Italia holder dominated Parma 2-0 with Dries Mertens and Lorenzo Insigne on target.
The first half saw Granada in complete control of the game, although the visitors defended stoutly. When the home side had a sniff of goal, it was kept at bay by young goalkeeper Giorgi Mamardashvili.
World number one Judd Trump will take on Kyren Wilson, while Australia's Neil Robertson meets Shaun Murphy. Enditem
But Flamengo defended stubbornly thereafter to secure their third win from four matches.
Cadiz entertain Sevilla in another rescheduled game that has taken 24 hours off Sevilla's recovery time from the European Supercup final in Budapest. Valladolid face Celta, who will hope that striker Iago Aspas continues the form he showed as they beat Valencia a week ago. Enditem
Artists from across China were allowed to put their paper-cutting works on show. During Sunday night, a concert that was accompanied by a light display was held to perform some Beijing 2022 promotional musics on the Great Wall.
Shenhua doubled the lead eight minutes after the break when Peng's header found Bi Jinhao, who resisted a shoulder-to-shoulder challenge in the box to drill home.
The 16 teams were divided into two groups this season and the top four in each group will advance into the Final Group A for the championship race.