Katie Boulter insists the champagne remains firmly on ice despite her stunning start to the British grass court season. The nation's new women's No.1, 26, clinched her first WTA title at the LTA's Rothesay Open Nottingham on Sunday, but suffered a straight sets defeat against Chinese star Zhu Lin at the LTA's Rothesay Classic Birmingham on Tuesday. Ad Boulter, who is a graduate of the LTA's Pro Scholarship Programme, embarked on a brilliant run to the semi-finals in Surbiton earlier this month, before her triumph in the battle of the Brits against Jodie Burrage at the weekend cemented her status as Britain's highest-ranked player.