Naomi Osaka, Serena Williams Face Off in Australian Open Semifinal

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Serena Williams takes on Naomi Osaka in a highly anticipated semi-final match at the Australian Open. Williams is in the midst of attempting to tie the all-time Grand Slams mark, while Osaka's stardom continues to rise. So, who is the showdown bigger for? Sports Illustrated host Robin Lundberg discussed with SI senior writer Jon Wertheim.