Britain's Andy Murray began what is likely to be his final Queen's appearance with a gritty win over Australia's Alexei Popyrin.
Former world number one Murray, 37, earned a 6-3 3-6 6-3 victory in his first-round match on Tuesday.
Murray, who is a five-time champion at Queen's, is not expecting to play past the Paris 2024 Olympics as he contemplates where and when he will end his glittering career.
Elsewhere, compatriot Dan Evans had to retire with a knee injury after slipping during his opener against American opponent Brandon Nakashima.
There was better news for British number six Billy Harris, who earned the best win of his career by beating Argentine world number 32 Tomas Martin Etcheverry.