The draw of any Grand Slam builds a narrative, but some storylines are bigger than individual matchups. Here's what to watch in Melbourne

When Carlos Alcaraz is on court for a training session, perhaps working on his newly revamped service motion, he's doing so to buttress a game already good enough to claim four Grand Slam titles.

Carlos Alcaraz said Saturday his burgeoning rivalry with Jannik Sinner brought out the best in him, with the Spanish star driven by winning more Grand Slam titles and toppling the Italian as world number one.