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The main event for UFC 251 is off after Valentina Shevchenko was forced to drop out due to a leg injury, per Marc Raimondi of ESPN.
She was supposed to defend her UFC women's flyweight title on June 6 againstJoanne Calderwood, but the current champion is not fit enough to compete.
Calderwood said she expects the bout to be "pushed back" to a later date when both are healthy.
This article will be updated to provide more information on this story as it becomes available.
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