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Australian Open: Roger Federer's opponent Tenny Sandgren collides with ballkid

Roger Federer's opponent Tennys Sandgren needed medical attention when a ballkid collided with him during a crucial stage of their quarterfinal showdown at the Australian Open.

The bizarre incident at Rod Laver Arena on Tuesday came as the pair were tied up 3-3 in a tense fourth-set tiebreak.

Confusion initially surrounded the incident, with Sandgren heard saying 'knee into my calf'.     

Roger Federer 's opponent Tennys Sandgren needed medical attention when a ballkid collided with it knee while she was trying to pass him during a change of ends (pictured)

Replays showed the ballkid running at pace before his right knee slammed into the American's left leg, leaving him wincing in pain.  

The crowd also gave out an audible gasp after a replay showed the ballkid's knee striking the side of Sandgren's knee.  

He took a moment to compose himself, visibly in pain, before walking back to the baseline and continuing to push Federer to the limit. 

Sandgren stunned Federer early by taking out the second and third sets before the Swiss maestro saved seven match points to take Sandgren to a fifth set. 

Despite the courage shown by the American, Federer was able to win the fifth six games to three to move into the semi-final round. 

Sandgren took a moment to compose himself, visibly in pain, before walking back to the baseline and continuing to push Federer to the limit

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