The Serpentine Gallery is delighted to announce that the Serpentine Gallery Pavilion 2009 will be designed by architects Kazuyo Sejima and Ryue Nishizawa, of the leading Japanese practice SANAA. Sejima and Nishizawa’s Pavilion will be the architects’ first built structure in the UK and the ninth commission in the Gallery’s annual series of Pavilions, the world’s first and most ambitious architectural programme of its kind. The Pavilion will open in July on the Serpentine Gallery’s lawn, where it will remain until October.