Victor Wembanyama might be the biggest nerd on the planet -- literally -- 'cause the 7-foot-4 NBA superstar was just spotted shopping for Pokémon cards and Manga books at a San Antonio store!
TMZ Sports has learned ... the Spurs center visited Heroes & Fantasies -- a collectibles shop some 20 minutes away from the Frost Bank Center -- on Tuesday night in search of adding to his personal collection.
The store's vice president, Adam Conley, says Wemby arrived just before close .