British number two Dan Evans has joined nine top 100 players who will play next month's Aegon Trophy in Nottingham.
The tournament at the Nottingham Tennis Centre, which is free entry to fans, starts on 2 June.
Australian Matthew Ebden returns to defend his title and Sergiy Stakhovsky, who last year beat Roger Federer at Wimbledon, is also playing.
Evans, who reached a career-high of 123 in the world this year, made the quarter-finals at last year's event.
Tournament director Paul Hutchins said: "This year's entry list is strong with a number of players with title-winning track records in Nottingham returning in search of further glory.
"It's great for players to hone in on their grass-court game ahead of Wimbledon."