New signing Donny van de Beek gave United a chance with a goal in his debut but Zaha's excellent second strike five minutes from time condemned them to defeat.
Meanwhile, Sport Recife continued their impressive recent form with a 1-0 home victory over Fluminense. Former Flamengo striker Hernane scored from the penalty spot after Leandro Barcia was brought down by Egidio Pereira.
"You deserved a farewell befitting who you are: one of the most important players in the history of the club, achieving great things for the team and on an individual level," commented Messi on social media.
Bach is also optimistic that vaccines could be available in the first half of 2021 after consulting medical experts from the World Health Organization.
Four minutes later it was 2-0 after Mane slotted the ball home after a terrible error from Chelsea keeper Kepa Arrizabalaga, whose attempted clearance was blocked by the forward.
The Rubronegro reported 11 positive cases in their traveling squad after losing to Independiente 5-0 in Quito last Thursday. They beat Barcelona 2-1 in Guayaquil on Tuesday despite being forced to field a team mostly comprising reserves.
Last weekend's home defeat to Crystal Palace was a shock to Manchester United fans, immediately prompting fears that last season's progress could be lost after a frustrating summer in the transfer market.
There will be an exciting lineup in the women's 3,000m. The event will consist of Kenyan quartet Hellen Obiri and Beatrice Chepkoech, 2019 world champions over 5,000m and 3,000m steeplechase respectively, in addition to Olympic 3,000m steeplechase silver medalist Hyvin Kiyeng, and world 5,000m runner-up Margaret Chelimo.
Tianjin dominated the match with strong attacks from Chinese national team players Li Yingying and Wang Yuanyuan, while Hebei hardly created a threat in the first set.
Eibar has started the campaign with two defeats, while Athletic Bilbao lost in Granada on the opening day of the season. However, with fans unhappy at Athletic's disappointing end to last campaign, question marks over coach Gaizka Garitano's defensive instincts and a lack of goals in attack, a defeat in the Ipurua Stadium would only increase the discontent surrounding a club that has so far failed to make any summer signings. Enditem
Seventh-placed Marseille needed a late header from substitute Valere Germain to clinch a 1-1 home draw with Lille in the latest match of the day. Brazilian forward Luiz Araujo helped Lille take the lead at the start of the second half and could have doubled it when his effort hit the cross bar in the 65th minute.