Nick Kyrgios -- one of the biggest stars in men's pro tennis -- is pulling out of the Olympics ... saying the big decision is, in part, due to Japan officials barring spectators from the event.
The 26-year-old Australian made the announcement Thursday evening ... just hours after Olympic officials said no fans would be allowed to watch the Games in-person this summer due to a spike in coronavirus cases in the area.
"It's a decision I didn't make lightly," Kyrgios said. "It's been my dream to represent Australia at the Olympics and I know I may never get that opportunity again.