World number one Carlos Alcaraz announced the start of his Miami Open title defence in emphatic fashion, losing just two games in a comprehensive win over Facundo Bagnis.
The US Open champion, 19, needed 65 minutes to complete a 6-0 6-2 victory against the Argentine, ranked 100.
The Spaniard, who triumphed at Indian Wells last week, has lost just one of his 16 matches this year.
He must defend his title in Miami to stay as the world's top ranked player.
That is despite the absence of Novak Djokovic - who is not permitted to enter the US because of his Covid-19 vaccination status - as he requires the 1,000 ranking points that would accompany success to stay ahead of the Serb.