In the latest edition of Second Serve, our new weekly snapshot of the tours, BBC tennis reporter Jonathan Jurejko looks at the key talking points following the Miami Open.
Jannik Sinner isn't even allowed to play competitive tennis, yet he's still strengthened his grip as the world's leading men's player.
Sinner, of course, is almost halfway through a three-month ban for a doping offence, which ruled him out of the 'Sunshine Double' in Indian Wells and Miami.
But he watched on as nearest rivals - Alexander Zverev and Carlos Alcaraz - both fumbled the chance to significantly narrow the gap at the top of the ATP rankings.