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US Open 2015 semifinals live blog: Live analysis and updates on the Serena Williams vs Roberta Vinci semifinals match from New York. 

By Jamie Lisanti
September 11, 2015

NEW YORK – Roberta Vinci upset No. 1 Serena Williams in three sets in the U.S. Open women’s semifinals on Friday, ending Williams's hopes of completing the calendar Grand Slam. Vinci, who is unseeded, won Friday’s match 2–6, 6–4, 6–4 over Williams, who has won the last three U.S. Opens. Entering Friday, Williams had never dropped a set against Vinci. 

Point-by-point analysis and updates:

 

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