Osaka still no. 1

Japan’s Naomi Osaka maintained a slender lead over Romanian Simona Halep at the top of the WTA rankings released on Monday. Osaka now sits 185 points ahead of Halep, with Czech pair Petra Kvitova and Karolina Pliskova in third and fourth. American Madison Keys, winner of the WTA event in Charleston last week, jumped four spots to 14th.