LONDON—British sports personalities from Andy Murray to Marcus Rashford rallied to the defense of teenage tennis sensation Emma Raducanu on Tuesday after suggestions she quit her debut Wimbledon because she could not handle the pressure. The previously little-known 18-year-old, ranked 338 in the world, was the last of 14 British players standing in Wimbledon after three superb wins that had fans on their feet. But she was forced to retire against Australian Ajla Tomljanovic in their last-16 match on Monday with breathing difficulties. American former Wimbledon champion John McEnroe suggested while commentating for the BBC that the occasion “got a little bit too much” for Raducanu, while some others took to social media criticizing her for bowing out while losing. The case drew comparisons with world No. 2 Naomi Osaka, who withdrew from the French Open after opening up on anxiety she suffered from media interviews after intense matches. Raducanu …