国家网球中心（钻石球场）

Diamond Court of the National Tennis Centre stands on the western side of the tennis park at 2 Lincui Road, Chaoyang District, with the North Fifth Ring Road to the north and Aolin West Road to the east. Construction began in late 2009, the court was completed and lit on 10 August 2011, and it was formally named the National Tennis Court on 7 September that year; during design it had been called the Flower Crown. It replaced Lotus Court as the main stadium of the China Open, giving the Olympic Green a three-layer tennis economy of Olympic legacy, professional tournament and public play. The building occupies a 16,900 square metre plot with 51,199 square metres of floor area over one basement and eight upper levels, seating 13,520 spectators, with some sources quoting 14,602 fixed seats. It also contains 48 sky boxes on two levels, the only double-tier box arrangement at an Asian tennis venue. Inside, a 1,500 square metre players' area can hold 500 players at once, supported by six private player rooms of 15 to 30 square metres with rest, shower and massage functions. An external viewing deck rings the bowl, letting spectators watch neighbouring courts, the tournament festival plaza and the Olympic Forest Park. The design, by the Shi Yi studio of the China Architecture Design and Research Group, pursues unity of form and function: sixteen groups of V-shaped columns support both the stands and the cladding, and the V motif and triangular language run through the whole composition, with a concrete primary structure and no applied ornament. The roof is a horizontal sliding, bi-directional retractable structure that closes or opens in twelve minutes, switching the venue between an outdoor court and an indoor hall and protecting the China Open night sessions and rain-affected schedules. During the 2025 tournament the park recorded more than 45,000 entries in a single day, a record. Lincuiqiao station on metro line 8 serves the eastern entrance on foot, drivers arrive from the Aolin West Bridge of the North Fifth Ring Road, and temporary traffic controls and shuttle services operate during the tournament.