A station on the Northern Line On the boundary between Travelcard Zone 3 and Travelcard Zone 4. Opened 13 September 1926. On the original plan it had the name "Merton Grove". For geographical accuracy, the station was originally named "South Wimbledon (Merton)"
The station is the southernmost station on the London Underground network with platforms below ground.
More information on the Wikipedia page [1]. The TfL page is [2]. Some information here