 Rishi Sunak is preparing to tell wavering voters that a big Labour win is not a foregone conclusion. The Tories claim it could be prevented by a small number of people lending them their vote in constituencies where the result is likely to be close. The British tennis star Andy Murray has pulled out of this year's Wimbledon singles tournament because of continuing medical problems with his back. Murray had said this would be his last year entering the contest, meaning he will now not play again.