Boca had 68% of possession and seven shots on target to Libertad's one, in what was largely a lopsided contest at La Bombonera.
Tao Guannan from Guangdong and Shandong's Liu Zongyu took second and third places respectively.
Rumors speak of former Augsburg coach Manuel Baum of possibly taking over as the new head coach.
The win also saw the team from northwest France climb to the top of the table, two points clear of second-placed Lille.
Real Madrid could have had a second when Luka Modric hit the post.
The Spaniard will next take on 18th seed Grigor Dimitrov of Bulgaria, who beat Slovakia's world number 102 Andrej Martin 6-4, 7-6, 6-1.
Sergio Ramos won the game for Madrid with an 82nd minute penalty awarded through VAR after Marc Bartra was judged to have handled a ball from Borja Mayoral, although nobody had appealed for the foul.
The "TSG" should have added another goal to their lead but neither Christoph Baumgartner nor Kramaric were able to beat Neuer at the half hour mark.
Beijing Guoan announced Sunjic's arrival from Dynamo Moscow on Wednesday before immediately confirming his loan to Henan Jianye, who sit bottom of the eight-team Group A in the ongoing 2020 CSL season, with only one win and three draws after 14 matches. Enditem
"In fact, we're still waiting for legal guidelines to run the games," Dortmund's sports director Michael Zorc complained.
The shortlist for the Best Player award was selected by a jury comprising the 80 coaches of the teams that took part in the group stages of the 2019/20 UEFA Champions League and UEFA Europa League, along with 55 journalists selected by the European Sports Media group, one from each of UEFA's member associations.