Angelique Kerber on course to replace Serena Williams as world number one
Germany's Angelique Kerber will replace Serena Williams as world number one if she wins the final of the Cincinnati Open on Sunday.
Second seed Kerber, 28, beat Romanian Simona Halep 6-3 6-4 in Saturday's semi-final to set up a meeting with Czech Karolina Pliskova.
American Williams, 34, has been top of the world rankings for 183 consecutive weeks, and 306 in total in her career.
She withdrew from the tournament with a shoulder injury on Monday.
Kerber beat Williams to win the Australian Open in January, but Williams came out on top in the Wimbledon final last month.
World number 17 Pliskova, 24, upset fourth seed Garbine Muguruza of Spain 6-1 6-3 on Saturday to reach the final in Cincinnati.