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What to Watch on Thursday, Day 11 at the Australian Open

A blockbuster Australian Open semifinal between No. 1 Novak Djokovic and No. 3 Roger Federer will be the latest installment in the tennis rivalry that has come to define recent seasons.

It will be a rematch of last year's final at the U.S. Open and at Wimbledon, both of which Djokovic won.

"We are, you know, big rivals," said Djokovic, the defending champion. "We've played so many times against each other. There's a lot of tension. There's a lot at stake, I'm expecting a great fight."

It will be the 15th time Djokovic and Federer meet in a Grand Slam, extending their own record for the most matchups at the majors in the Open era, which started in...