Emma Raducanu «must become more robust» if she is to thrive at the top of the women's game, believes Great Britain's Billie Jean King Cup captain Anne Keothavong. As a result of a foot blister, Raducanu's movement was severely compromised during her heavy 6-1, 6-1 singles rubber defeat to Marketa Vondrousova on Saturday, a result that contributed to GB's 3-2 loss to the Czech Republic in Prague that saw them fail to qualify for the event's finals in November. Ad/> That injury followed other problems to afflict the 19-year-old during the past year, which have included a hand blister at January's Australian Open and a back complaint at Indian Wells.