The conversion of the original athletics hall into the National Padel Centre is based on a comprehensive transformation of the interior space. The architectural proposal addresses the brief through a new spatial and operational layout that respects the existing structural framework. New functions—including a restaurant, retail shop, and VIP lounge—are inserted within the original structure, with the overall arrangement providing a direct operational connection to the sports area. The visual concept draws inspiration from the sport itself, translating its distinctive elements into the interior architecture through materiality, colour, and layered grid patterns that extend throughout the space down to carefully crafted details. The primary spatial concept is organized around the building's main architectural axis. A new entrance is positioned on this axis, linking the restaurant on one side and the retail shop on the other. Both areas are oriented to provide direct visual contact with the courts while allowing seamless circulation for both spectators and players into the sports facilities. In front of these two functions, a new spectator stand forms a shared forecourt, symmetrically aligned with the central axis of the playing area. The restaurant and retail spaces are designed to accommodate both everyday operation and the increased demands of tournaments. In addition to its dining function, the restaurant serves as a multifunctional event space, while the retail shop also operates as a café and refreshment area for players passing through the venue. Above these ground-floor facilities, a VIP lounge with an outdoor terrace is located on the mezzanine level, offering unobstructed views of the courts. The 4,300 m² sports hall accommodates twelve glass-enclosed padel courts arranged within the hall's curved floor plan. Their layout follows the grid of the existing steel structural frame while respecting structural constraints, required clearance distances, and maximizing the efficient use of the available space. The defining design motif is a metal grid inspired by the mesh of the padel court fencing. This element runs consistently throughout the interior, appearing as wall cladding, partition screens, the backing for the retail display system, and even as the diffuser for the circular lighting fixtures in the restaurant. Replacing the original solid partitions in the retail area with perforated metal has created a lighter, more open environment with improved visual connections to the courts. The material and colour palette combines the cool character of galvanized steel, shades of blue derived from the court surfaces, and warm oak timber used predominantly in the restaurant. The interior design is completed through a comprehensive approach to detailing, with almost all furniture and interior elements custom designed and fabricated. The restaurant bar, dining tables, and retail counters are clad in a pattern inspired by the movement of a tennis ball. Benches, counters, and modular shelving systems maximize the functional potential of the steel grid structure. The project also includes a bespoke retail display system, carefully designed to suit the specific requirements of each product.