Dickwella scored 74 in a Sri Lankan total of 163 after they were sent in to bat at Wanderers Stadium.
The left-handed Dickwella was dropped on 25 when JP Duminy, running back from backward point, could not hold on to a high leading edge from Kagiso Rabada's bowling.
There was a delay of an hour after a swarm of bees drove the players from the field after 26.3 overs and Dickwella was tested several times by some short-pitched deliveries from South Africa's fast bowlers.
Sri Lanka got off to their best start of the series with Dickwella and captain Upul Tharanga putting on 60 for the first wicket before Tharanga (31) top-edged a pull against Rabada, one ball after Dickwella had been dropped, and was caught at fine leg.
With Sri Lanka needing to win to keep the five-match series alive, their middle-order batting once again proved brittle, especially against short-pitched bowling.
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