The other two German participants - RB Leipzig and Borussia Monchengladbach - have harder tasks in Groups F and B respectively.
McDonald tried to play more aggressively in the third set, but it was too late and not enough to overturn a match against the greatest ever tennis player on clay.
Boca had 68% of possession and seven shots on target to Libertad's one, in what was largely a lopsided contest at La Bombonera.
In the other game in Changzhou, Kunshan FC beat Xinjiang Tianshan Leopard 3-2, and Nantong Zhiyun defeated Heilongjiang Lava Spring 1-0. Enditem
He led the Rio de Janeiro club to their most recent Brazilian Serie A title in 1995 before leaving the following year to take charge of Portugal's Benfica. Enditem
World No. 1 and top seed Novak Djokovic will kick off his campaign for an 18th major title against Sweden's Mikael Ymer later on the central court. Enditem
Rui Naiwei of China plays chess on line during the 3rd round match at the third edition of Wu Qingyuan Cup Women's Go Tournament in Fuzhou, southeast China's Fujian Province, Sept. 29, 2020. (Xinhua/Lin Shanchuan)
Rangnick has successfully worked in Gelsenkirchen twice in 2004 and 2011, and since then enjoys high respect among the club's supporters.
Standing 1.93m tall, Yang was a consistent threat in the paint, improving Shandong's halftime lead to 27 points.
Villarreal travels after an easy 3-1 win at home to Alaves and with strikers Paco Alcacer and Gerard Moreno both in excellent form after netting six goals between them in Villarreal's first four games of the season.
QINGDAO, China, Sept. 30 (Xinhua) -- Zhang Yufei, who broke the Asian record in the women's 100m butterfly in the preliminary heat on Tuesday, captured gold in the final at the Chinese national swimming championships here on Wednesday.