The Stella Artois Championships at Queen's Club will keep its traditional knockout format for this year's event, which begins on 11 June.
Lleyton Hewitt won last year's championship
Tournament organisers have opted not to introduce a round-robin phase, which will feature in a number of ATP events this year, because of time constraints.
The London grass-court event cannot begin until Monday 11 June because of the French Open final the previous day.
Organisers said they could not host the round-robin phase without an extra day.
"Without the extra day, there was a risk that some matches would be 'dead rubbers' if weather delays occurred," said tournament director Ian Wight.
"The event typically features a large number of highly-ranked singles players also competing in the doubles competition.
"In addition, the surface takes longer to restore than others after rain and as a result, the pressures on scheduling are increased."