Emma Raducanu puts her red-hot form to the ultimate test as she takes on World No 1 Iga Swiatek in the quarter-finals of the Stuttgart Open. The 2021 US Open champion has won four matches in row - her best run of results since her shock grand slam victory as a 18-year-old wildcard - with her two wins at the Billie Jean King Cup at the weekend followed up by comprehensive wins over Angelique Kerber and Linda Noskova.