first_headline US Open Day 11: Tennis Has a New World No. 1 Elena Rybakina ensured that she will be the new women’s World No.1 next week after reaching the US Open semifinals. ← The dress that proved elegance is the best revenge: We're all still obsessed with Diana's most famous gown 30 years on...now it's up for auction. Don't be surprised if it fetches over $1million, says LAURA CRAIK Brooklyn teachers who witnessed 9/11 as children reveal what they want the next generation to remember →