According to Wikipedia, Donnie Yen one beat up eight men guys in a single fight:
There's one reported occasion that confirms him being an efficient martial artist. According to news reports by Hong Kong news channels in the late 1990s, Yen was at a nightclub with his then girlfriend, Joey Meng. Inside the nightclub, Joey got harassed by a troublesome gang who had taken an interest in her. Yen warned them to leave her alone but to no avail. As Yen and Joey left the club, the gang followed and attacked Yen. According to the news, Yen beat up eight members of the gang who were hospitalized.
The source is in Chinese so I don't know what says or how reputable it is. I've seen Donnie Yen movies where he's tackled multiple people at once in stage-combat, but surely it doesn't go down quite the same way in real life. I imagine it'd be almost impossible to defend from more than a couple of guys.
Is there any evidence this actually happened?