Having been forced to follow on after being dismissed for 195 in response to the Titans’ daunting score of 647-7, WP fared better in their second innings to reach the end of day three on 260-5.
But Titans all-rounder Neil Brand’s three morning-session scalps helped bowl WP out for 313 (Yaseen Vallie couldn’t bat due to an injury).
Harmer took 3-149 to go with his excellent first-innings figures of 7-76.
In Potchefstroom, the EP Warriors beat the North West Dragons by 130 runs.
The Warriors declared on 364-2 after unbeaten centuries from Matthew Breetzke (152* off 265 balls) and Rudi Second (103* off 122).
Needing 349 runs to win, the Dragons were bowled out for 218, with Wesley Marshall (65) and Nicky van den Bergh (64) top-scoring. Mthiwekhaya Nabe took 3-28 and Lizo Makhosi 3-33 for the Warriors.
In Durban, the KZN Dolphins and Free State Knights played to a draw.
An outstanding innings of 177* off 357 balls from Matthew Kleinveldt enabled the visitors to declare on 397-4.
But the Knights bowlers could only pick up five second-innings wickets and the captains shook hands with the Dolphins on 174-5.
4-Day Series Round 3 Day 4 scores:
Division One:
Central Gauteng Lions beat Boland Rocks by an innings and 30 runs
Rocks: 170 & 150
Lions: 350
ALSO READ: Unbeaten Lions smash Rocks
EP Warriors beat North West Dragons by 130 runs
Warriors: 334 & 218 after 69.4 overs; W Marshall 65 (73), N van den Bergh 64 (117); M Nabe 3-28, L Makhosi 3-33
Dragons: 350 & 364-2 dec after 95 overs; M Breetzke 152* (265); R Second 103* (122); L Zuma 1-29, D Potgieter 1-53
Northerns Titans beat Western Province by an innings and 139 runs
Titans: 647-7
WP: 195 & 313 (f/o) after 85.4 overs; D Smith 83 (157), K Verreynne 50 (91); N Brand 3-71, S. Harmer 3-149
KZN Dolphins drew with Free State Knights
Dolphins: 226 & 174-5 after 69.2 overs; R de Swardt 51* (84), K Petersen 43 (102); G Coetzee 3-51, J Snyman 2-57
Knights: 397-4 dec after 108.3 overs; M Kleinveldt 177* (357), J Snyman 94 (125); O Modimokoane 2-58, E Bosch 1-71
Division Two
Limpopo Impalas drew with Northern Cape Heat
Impalas: 290 & 185 after 61 overs; M Nofal 61 (129), D Radebe 39 (50); A Swanepoel 4-65, E Jones 2-12
Heat: 350 & 121-7 after 32 over; A Swanepoel 44* (50), J van Dyk 18 (32); S Lunga 4-32, M Nofal 2-39
South Western Districts beat Eastern Storm by 119 runs
SWD: 242 & 193
Storm: 250 & 65
ALSO READ: Whitehead takes 10 wickets in an innings for SWD
KZN Inland Tuskers beat Eastern Cape Iinyathi by seven wickets
Iinyathi: 384 & 106 after 51.5 overs; J Niemand 51 (112), N Yikha 28 (73); L Schlemmer 6-31, M Erlank 3-17
Tuskers: 384 & 108-3 after 21.4 overs; L Schlemmer 36 (42), A Mogakane 18 (27); T Mnyanda 1-13, S Jamison 1-22
