 In the United Kingdom, "Problem" debuted at number one on the UK Singles Chart on July 6, 2014 ― for the week ending date July 12, 2014 ― becoming Grande's fourth charting single and first chart-topper in Britain and Azalea's seventh and first respectively.According to the Official Charts Company, "Problem" made British chart history upon its debut as the first song to top the charts in Britain based on both sales and streaming, with a combined 'chart sales' figure of 113,000.In the Belgian Ultratop 50, "Problem" peaked at number 26 in Flanders and number 40 in Wallonia.