Sri Lanka 104-3 at lunch on day three
South Africa's Dale Steyn (R) celebrates with teammate Hashim Amla (C) following the dismissal of Sri Lanka's Kaushal Silva during the third day of the opening Test in Galle on July 18, 2014 - by Lakruwan Wanniarachchi
Upul Tharanga was batting on 65 and Lahiru Thirimanne was yet to open his account.
Sri Lanka trail South Africa by 351 runs with seven wickets in hand.
The second and final Test will be played in Colombo from July 24-28.