Rain has delayed the start of the Aegon Championships at Queen's Club in London.
Play was due to start at 12:30 BST on Monday, but has been put back to 13:30.
France's Richard Gasquet meets American Steve Johnson in the first match, before British number four Dan Evans' meeting with Paul-Henri Mathieu.
British number one Andy Murray also faces a Frenchman - world number 49 Nicolas Mahut - in his first-round match on Tuesday.
Mahut, 34, goes into the tournament having claimed the fourth ATP title of his career at the Ricoh Open in the Netherlands.