Top seed Alexander Zverev eased into the third round of the Miami Open with a 6-2 6-4 win over Britain's Jacob Fearnley at Hard Rock Stadium on Saturday.
Zverev's title hopes received a boost on Friday when second-seed Carlos Alcaraz crashed out with a shock defeat to Belgian veteran David Goffin.
With no Jannik Sinner while the Italian serves a doping ban, the German Zverev's main challenger, on paper, should be Novak Djokovic.
Zverev lost his opening game at Indian Wells but looked sharp on his debut on the South Florida stadium court.
"I'm generally happy with my level today," said Zverev, the 2018 Miami finalist. "
In Indian Wells it was very different, so I hope I can continue playing this way and have a great week here," he said.
The 27-year-old took 74 minutes to take care of business against Fearnley and said his extra time off as a result of his surprise defeat to Tallon Griekspoor had been valuable.
"I had to start thinking about my game again, thinking about how can I improve and how can I get better?" he said.
"Had two weeks time to practice and work on my game again and I did that - hopefully this is the first of many matches for me here," he added.
There was an upset for 13th seeded Ben Shelton, the third ranked American who was knocked out by 20-year-old wildcard Coleman Wong of Hong Kong.
Wong, 128th in the world, battled his way to a 7-6 (7/3) 2-6, 7-6 (7/5) victory despite letting a slip a 5-2 lead in the final set.
His victory provides him with a place in the third round of a Masters 1000 for the first time in his career.
"I always trust myself to play in these big stages… I had a tough time [during] the Covid times. I didn't play for a year and a half and I'm really lucky my team keeps supporting me. I'm really happy and this is for you Hong Kong," said Wong.