World number eight Daria Kasatkina has given the thumbs down to the idea of "trash-talking" between professional tennis players, saying that disparaging or boastful comments under the guise of banter would not work well in an "intelligent" sport. After Frances Tiafoe called on tennis to loosen its strict rules governing the behaviour of fans at matches to help attract young crowds, fellow Americans Jessica Pegula and Coco Gauff said they would not mind some "trash-talking" too.