Australian Open 2025 begins on January 12 and here's everything you need to know, from rivalries, comebacks and newbies to look out for.

Injury tripped up Opelka and Osaka at the finish line; Rybakina moved forward ... then back; Sabalenka survived a new Kudermetova; the U.S. won United Cup; and Gauff vs. Swiatek turned spicy, then icy ...