On December 3, 2021, Crown Princess Victoria and Prince Daniel attended the 125th anniversary event of the KLTK – the Royal Tennis Club of Stockholm (KLTK - Kungl. Lawn Tennis Klubben), at the Royal Tennis Hall in Stockholm. The Royal Tennis club was founded in 1896, the Royal Tennis Hall was built in 1943. In October each year, KLTK hosts the ATP-tournament Stockholm Open, which attracts top players from around the world.