Serena Williams Upset at US Open, Ending Grand Slam Dream

The tennis star was defeated in the semi-final by Roberta Vinci. The loss ends Williams' quest to be the first women's player since 1988 to win all four major tournaments in a single calendar year.
2:37 | 09/12/15

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Transcript for Serena Williams Upset at US Open, Ending Grand Slam Dream
took a picture of themselves. A selfie stick. The morale is interesting to see. Ihihank T wt' that sestrik most people. The worstions. All fueled by hope and desperation. We want to turn over to Tom llamas in for Ron tr stories. We want to start with really a craze di scene,evtias dngta piuresctrom that T massive crane collapse. Officials say a powerlfu storm sauin aradiabise cdau a werito crang toneopovpl there ink gll at least 107 people and injuring more than 200 hersot. It crashed through the roof the grand mosque in Mecca, the world's largest mosque, T Co sell S capop days before the start of the hajj, the annual lgripimage expected to bring 2 ousted. The proud favorite and number one player in the world falling short. She's done it an extraordinary upset. Reporter: After a second match tied to a 300-1 underdog from Italy. Well, how about that? Reporter: Roberta Vinci ranked 43rd saying she never expected to advance to her first ever singles finals against Williams. First time she takes a set off Serena. When I wake up I say, okay, I have semifinal today. Try to enjoy. Don't think about Serena, play, enjoy, enjoy. I didn't expect that I'd win. Reporter: Even apologizing for busting up what many tennis fans were hoping would be Serena's crack at history. The first calendar year grand slam in three decades. Today is my day, sorry, guys. Reporter: After the loss Serena giving credit to the victor. I think she played literally out of her mind. She did not want to lose today. Neither did I. Reporter: But refusing to address her shattered slam. I'm -- I don't want to talk about how disappointing it is for me. If you have any other questions I'm open for that. I think it took its toll and denied she felt any pressure but I could tell the way she was moving and I think it's all about pressure. Reporter: Now, before Williams lost the average ticket price for the women's finals was $1400 but within 20 minutes of her defeat that dropped by more than half. Now, it is worth noting history will still be made tonight. It's the first all-italian women's finals in grand slam history so gives us Italians a little something to be happy about. Bon Giorno. I don't know if that was incontext. With a last name like ski aft Mara has, why not. Absolutely, how could it not. Staying on the Italian tip, let's get it over to rob Marciano now with the forecast.

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

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