15-Year-Old Catherine Bellis’ Stunning US Open Win Lights Up Social Media

The 15-year-old is the youngest player to win a match at the U.S. Open since Anna Kournikova in 1996.
3:00 | 08/27/14

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Transcript for 15-Year-Old Catherine Bellis’ Stunning US Open Win Lights Up Social Media
talk about a big win at the U.S. Open. If the name Catherine bell Elisabeth doesn't ring a bell it will soon. The player ranked -- well maybe not currently. Things are changing for her. Her ranking as of yesterday was 1208th and shocked everyone when she beat the 12 seed dominika cibulkova and suddenly the newest tennis star was born. ABC's Sara Haines is in social square with her story. Hey, everyone who knows you knows you're dying for this story. Catherine bell Elisabeth' amazing performance blew up Twitter. Mentioning her handle more than 12,000 times on Tuesday and it's just the beginning. She's done it. Reporter: It's the moment that had the tennis world on its feet. 15-year-old American Catherine Bellis leaping into the spotlight as the youngest woman to win a U.S. Open match in nearly 20 years. I went into the match thinking it was going to be such a great experience but never thought I would come out on top winning. Reporter: Neither did most. The California newcomer a wildcard nicknamed CICI competing professionally for just the 13th time her world ranking up in the thousands, her match against the tournament's 12 seed wasn't supposed to even be televised. As word spread of her impending victory the cameras flocked feeding the young prodigy. Feeling amazing. I'm still speechless. I'm still in shock about the match. Reporter: The last 15-year-old to win a U.S. Open match was Anna kournikova back in 1996. Bellis wasn't even born yet. A 12-year-old CICI just a fan posing with tennis greats maria sharapova and Danielle hasn't cove Virginia. It's crazy to think I'm here with all these other people. I never thought I would be practicing or sharing a court with, you know, a player that I watch on TV. The teen is the talk of the town now. Reporter: Tennis' newest it girl just enjoying her moment in the history books. Bellis was only 5 months old when Serena Williams won her first and see the action on our sister network, ESPN. George, Lara. Sara, she's got another big match coming up. Has to play the 48th ranked player next so rooting for CICI.

This transcript has been automatically generated and may not be 100% accurate.

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