Sri Lanka's Akila Dananjaya, centre, celebrates with his teammates after taking the wicket of South Africa's Keshav Maharaj. Dinuka Liyanawatte / Reuters
Sri Lanka's Akila Dananjaya, centre, celebrates with his teammates after taking the wicket of South Africa's Keshav Maharaj. Dinuka Liyanawatte / Reuters

Spinners put Sri Lanka on cusp of Test series whitewash against South Africa