Chemnitzer FC took the reins and disrupted Hoffenheim's build-up work in the opening stages, forcing Hoffenheim goalkeeper Oliver Baumann into action twice with early chances.
"I haven't had such results in quite a long time, so I'm very excited for it. Today, it's a loss, but it doesn't change for me much. Of course I would have loved to win today. It is what it is," Azarenka said.
"There is no place for racism in football but I don't think so," Villas-Boas said, "We will look at it later."
In 2014, Wang won the women's singles tennis title in the Incheon Asian Games. Enditem
After that, Osaka dominated and claimed the set 6-3.
The tournament which is part of the European Tour has been moved to 2021, returning to a March date which has been a tradition since the first Kenya Open Championship in 1967.
In a showdown between two clinical power-hitters, Osaka and Brady split the opening two sets, with Osaka claiming the tiebreak in the first and Brady taking the sole breaking chance in the second.
The "BVB" smoothed the way for their win with three first-half goals, while Dominic Volkmer's red card before half-time left Duisburg hopeless.
The ace claimed six ranking titles last season but failed to defend his world championship title in the season-ending tournament.
"The team are in a very difficult situation. We hope to win, and therefore the only thing we can do is keep fighting," said Bassogog.
In a message posted on Weibo on Friday, Wang, China's highest-ranked female tennis player, said she made the decision toughly and withdrew from the 2020 season.