By CHRISTOPHER CLAREY

SEPTEMBER 11, 2015

The Grand Slam seemed there for the taking. The Grand Slam will have to wait.
Two victories from joining the most prestigious club in tennis and with her path clear of all the most evident thorns and threats, Serena Williams ran into an unlikely roadblock in the form of Roberta Vinci.
In one of the biggest surprises in tennis history, Vinci, an unseeded Italian veteran playing in her first Grand Slam semifinal, defeated Williams, 2-6, 6-4, 6-4, at the United States Open on Friday.