The Latest: Federer saves 7 MPs to reach Aussie Open semis

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Tennys Sandgren of the U.S. serves to Switzerland's Roger Federer during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 28, 2020. (AP Photo/Lee Jin-man)

MELBOURNE – The Latest on the Australian Open (all times local):

6:50 p.m.

Roger Federer has saved seven match points before fending off 100th-ranked Tennys Sandgren in five sets to reach the Australian Open semifinals for the 15th time.

Federer, who has won six Australian championships among his 20 major titles, took an off-court medical timeout in the third set and was on the verge of a shocking quarterfinal exit in the fourth before rallying to win 6-3, 2-6, 2-6, 7-6 (8) 6-3.

The 38-year-old Federer will next play either seventh-time Australian Open champion Novak Djokovic or No. 32 Milos Raonic.

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6:15 p.m.

A ballkid collided with Tennys Sangren during a changeover in the pivotal fourth-set tiebreaker against Roger Federer in the Australian Open quarterfinals. Sandgren was walking to his court-side seat at 3-3 in the breaker when the ballkid ran along the side of the court and collided with his right calf muscle. The 100th-ranked Sangren told the chair umpire what happened, then stretched his legs and returned to the match. He had four match points in the tiebreaker but Federer rallied to force the match to a fifth set.