Britons Liam Broady, Jamie Baker and Oliver Golding have been handed the remaining wildcards for the Aegon Championships at The Queen's Club.
Broady, world junior number three, lines up alongside defending champion Andy Murray and former world number ones Andy Roddick and Lleyton Hewitt.
Broady reached the finals of the Wimbledon junior singles in 2011 while Baker is ranked 207 in the world.
Golding won the US Open junior tournament last September.
Leon Smith, Head of Men's Tennis at the LTA, said: "All three players have, in different ways, shown skill and determination to develop their games over the past 12 months, and I am confident they will all look to seize this opportunity to shine at such a prestigious event."
Broady, aged 18 from Stockport, will make his first appearance in an ATP World Tour-level tournament.
He won the Australian Open junior doubles in January, partnering Josh Ward-Hibbert, and the Orange Bowl late last year.
Glaswegian Baker, 25, has fought back from a life-threatening virus he contracted four years ago and has since won a Futures event in Mexico and reached the semi-finals of the Bath, Knoxville and Astana Challenger tournaments over the last year.
Golding, aged 18 from London, played Queen's last year losing 6-3 6-4 to the 2007 runner-up Nicolas Mahut. He's currently ranked 487 and has won two Futures tournaments this year, in Bournemouth and Newcastle.
Last year's runner-up Jo Wilfried Tsonga, the 2009 US Open champion Juan Martin Del Potro, and the world number eight Janko Tipsarevic are also entered in the main draw.
The 2010 runner-up Mardy Fish has withdrawn due to fatigue.