bowled some loose deliveries as they tried to unsettle the batsmen with short-pitched deliveries.
Both fast bowlers conceded wides with balls that climbed over wicketkeeper Denesh Ramdin’s head for four extra runs.
The tall Holder conceded 12 runs in his first over after replacing Gabriel but followed up with a maiden before Dean Elgar played across a full delivery and was out for eight.
With the West Indies having as many as three fielders on the boundary for much of the rest of the day,
Du Plessis and Alviro Petersen put on 56 for the second wicket before opening batsman Petersen was run out by a direct hit from Jermaine Blackwood at point for 42. It was a cruel blow for Petersen, whose place is under threat after a string of modest scores.
Du Plessis went on to make 68 off 123 balls with eight fours before he became the only victim of Benn, who bowled an economical unbroken spell of 24 overs, taking one for 62.
Score Board
West Indies won toss
West Indies 1st innings
K C Brathwaite c Elgar b Steyn 7
D S Smith b Harmer 47
L R Johnson lbw b Harmer 54
M N Samuels c du Plessis b van Zyl 43
S Chanderpaul st de Villiers b Harmer 9
J Blackwood lbw b Steyn 56
*†D Ramdin c & b Steyn 53
J O Holder c van Zyl b Steyn 23
J E Taylor c Steyn b Morkel 13
S J Benn c Bavuma b Morkel 5
S T Gabriel not out 4
Extras (lb 5, w 8, nb 2) 15
Total (all out; 99.5 overs) 329
Fall: 1-30, 2-80, 3-131, 4-162, 5-172, 6-266, 7-299, 8-316, 9-319, 10-329
Bowling: Steyn 25-6-78-4 (3w); Philander 19-2-73-0 (1nb); Morkel 19.5-1-83-2 (1nb, 1w); Harmer 26-5-71-3; van Zyl 8-2-13-1; Elgar 2-0-6-0
South Africa 1st innings
A N Petersen run out 42
D Elgar lbw b Holder 8
F du Plessis st Ramdin b Benn 68
*H M Amla not out 55
†A B de Villiers not out 32
Extras (lb 2, w 12, nb 8) 22
Total (3 wickets; 68.3 overs) 227
To bat: T Bavuma, S van Zyl, V D Philander, D W Steyn, M Morkel, S R Harmer
Fall: 1-48, 2-104, 3-157
Bowling: Taylor 13-1-59-0 (1nb, 1w); Gabriel 12-2-41-0 (5nb, 3w); Holder 14-3-46-1 (2nb); Samuels 5.3-0-17-0; Benn 24-5-62-1
Test debut: S R Harmer (South Africa)
Umpires: Aleem Dar (Pakistan) and P R Reiffel (Australia). TV umpire: B F Bowden (New Zealand). Match referee: R S Madugalle (Sri Lanka)