The Wimbledon champion will make her fifth appearance at the prestigious WTA Finals, where she was a finalist in 2016. The German is the second of eight singles players to qualify for the year-end showpiece.
Bethanie Mattek-Sands claimed her eighth Grand Slam title - and her first since coming back from knee injury - partnering with Jamie Murray to win US Open mixed doubles.
At 20 years old, Naomi Osaka made a lifelong dream come true by beating 23-time Grand Slam champion to win her maiden major title in New York. Find out what's next for the Japanese youngster in her champions press conference.
20-year-old Naomi Osaka became the first to win a Grand Slam singles title from Japan, sealing 23-time Grand Slam champion Serena Williams in straight sets in a dramatic US Open final.
Ashleigh Barty and CoCo Vandeweghe saved two championship points to shock Australian Open champions Timea Babos and Kristina Mladenovic and each win their first Grand Slam title at the US Open.