Stefanos Tsitsipas will play the Fever-Tree Championships at Queen's Club for the first time this summer, the tournament has announced.
The 20-year-old Greek is on the verge of breaking into the top 10 for the first time after beating Roger Federer and reaching his maiden grand slam semi-final at the Australian Open.
Tsitsipas' dynamic style makes him well-suited to grass and he made the fourth round at Wimbledon last summer.
He said: "I am really excited to be coming to The Queen's Club to play the Fever-Tree Championships for the first time.
"I have heard so much about this club, so many great champions have lifted the trophy over more than 100 years, and I am looking forward to having my own chance to compete on grass for the title in June."
Marin Cilic, who beat Novak Djokovic in the final last year, has also confirmed he will defend his title and the pair join British number one Kyle Edmund in the field.
