Brock Lesnar was cut in the opening segment of this week's WWE Raw when the back of his head hit underneath the turnbuckle where there is a spring and screw hook. Lesnar was thrown into the ring post by Triple H where he covered it with his hands for the bump, however, his head got caught on the exposed hook.
You can watch where it took place at 3:29 in the below video:
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We've included a photo of what turned out to be two lacerations that required 18 staples to close: