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I was today years old when I learned tennis cards were a thing. An autographed Serena Williams rookie card has sold for a record-setting $44,280 at an auction in New Jersey last weekend, according to ESPN. The previous record for a female athlete was a Mai Hamm rookie card which sold for $34,440. The executive chairman of Goldin Auctions said there are a lot of people putting together GOAT collections: "They want Pete, Ali, Jordan, Tiger, Brady, and they include Serena. I think that's the single biggest impact that is lifting her cards above all other women athletes." A 2003-04 LeBron James card sold at the same auction for $2.46 million.