Which football team that was relegated to Tercera División in the 1962–63 Segunda División season was founded in 1958?
1962–63 Segunda División:  Baskonia, Sabadell, Sevilla Atlético, Plus Ultra, Atl. 1962–63 Segunda División:  Baleares, Cartagena and Real Jaén were relegated to Tercera División. Sevilla Atlético:  Founded in 1958 it plays in Segunda División and is the reserve team of Sevilla FC, holding home games at "Viejo Nervión", with a 7,500-seat capacity.
Sevilla Atlético