No. 11 Daria Kasatkina, the 2017 champion and last year's runner-up to Collins, also joins a star-studded field that now features six top-12 players and four former Charleston champions.

For the first half-dozen years of her pro career, Daria Kasatkina was known as an ascending player, whose tennis was predicated on brains, not brawn, using her racket less as a high-powered weapon ...