Germany's Angelique Kerber backed up her status as the new world number one with a thrilling win over Czech Karolina Pliskova in the US Open final.
Kerber, 28, won 6-3 4-6 6-4 in New York to add the US Open to her victory at the Australian Open in January.
Pliskova's semi-final win over Serena Williams had already ensured the German will top the new rankings on Monday.
Kerber, who also reached the Wimbledon final in July, won the title in Flushing Meadows without losing a set.
More to follow.