When Ben Shelton reached the Australian Open quarter-finals in January, it was the first time the young American had travelled outside of the United States.
Now Shelton is increasing his global reputation back on home soil after going one step further at the US Open.
The 20-year-old from Atlanta has wowed the home crowds - with serve speeds touching 150mph, demonstrative celebrations and an infectious smile - on his way to the semi-finals.
"He's electric, no doubt about it. But he's still very raw," said American former player Jeff Tarango.
"He's a huge part of America's future - no doubt he will be top 10 in the world.