Juan Martin del Potro beat Japan's Kei Nishikori with ease in the round of 32 at the Miami Open.
The Argentine was so dominant that he outclassed Nishikori 6-2, 6-2 in just an hour and 12 minutes.
The world number 6 won 77% of his points from his first and second serves.
Here is a wrap up of other results.
World number 4 Grigor Dimitrov succumbed to his fourth defeat in the last five matches.
The Frenchman Jérémy Chardy beat the Bulgarian 6-4, 6-4 at the Miami Open.
World number 17, John Isner beat Russia's Mikhail Youzhny 6-4, 6-3 to set up a next round clash against world number three and the current top seed Croatian Marin Cilic.
27-year-old Canadian Milos Raonic saw off a stern challenge from Argentine Diego Schwartzman, beating him 7-6 (7-5), 6-3. Raonic will now face Jeremy Chardy in the next round.
Czech Petra Kvitová staged a remarkable comeback to beat American Sofia Kenin 3-6, 6-2, 6-4.
Ukrainian Elina Svitolina beat her Australian opponent Daria Gavrilova in a thumping fashion. After doing down 4-6 in the first set, she won the next two 6-0, 6-1.
Jeļena Ostapenko made light work of her Brazilian opponent Beatriz Haddad Maia beating her 6-2, 7-6.
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