The two best men's players in the world are reconfiguring the sport before their opponents' eyes. They don't know what to do about it

The top-ranked Sinner, who is the defending champion at Melbourne Park, and No. 3 Alcaraz are coming off a 2024 season in which they each won two Grand Slam titles.

Aces: Has made the final at Melbourne Park in three of the past four years but has yet to claim the championship. In two of those defeats in a title match, took a two-set lead before losing in five (to Jannik Sinner last year and to Rafael Nadal in 2022). ... Is 1-5 overall in Grand Slam finals.

They met last year in the Wimbledon final (won by Alcaraz) and Olympic final (won by Djokovic).The top seed is Jannik Sinner, who won the Australian Open and U.S. Open last year. He can break his tie with Nicola Pietrangeli for the most Grand Slam singles titles for an Italian.

The Australian Open kicks off each year's tennis Grand Slam tournament circuit. Who has taken home titles? Check out this all-time champions list.

Seedings for the Australian Open women's singles feature the top 32 ranked entrants.This protects other seeds from playing each other until the latter stages of the tournament.The Sporting News lists the women's seedings and eliminations at the ongoing tournament.