Michael Hogan duly took the new ball with Graham Wagg as Graeme Smith and Rory Burns opened the batting for Surrey and it was the former South African skipper who struck the day's first boundaries as he clipped Hogan both behind - and in front of - square-leg in his second over. Smith also edged Hogan just in front of third slip before clipping the next delivery to the mid-wicket boundary.
Burns also cover drove Wagg for four before Jim Allenby replaced Hogan at the Vauxhall End and beat the outside edge of Smith's bat in his second over shortly before the floodlights came on to augment the natural light as another bank of thick cloud built up over the Kennington area. It was Allenby who duly made the breakthrough as with the final ball of his third over he trapped Burns leg before.
Six balls later 34/1 became 34/2 as Dominic Sibley edged Allenby into Wallace's gloves, and next ball Wagg trapped Smith leg before - his 300th wicket in first-class cricket - as Glamorgan claimed their first bowling point after an hour's play with Surrey nose-diving to 34/3. Six runs later Allenby nearly struck again but an edge from Steven Davies' bat just dropped short of Stewart Walters at second slip. Another edge from Davies flew over the head of the slip cordon before Hogan switched to the Pavilion End.
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Ruadhri Smith then returned to the attack and nearly had Davies caught at second slip by Stewart Walters but the ball just evaded the outstretched fingers of the fielder. Mark Wallace also dropped a sharp chance in Hogan's next over as Ansari edged the Australian into and then out of the wicket-keeper's gloves. Davies also carved Smith high over the head of backward point for four before Wagg returned at the Pavilion End and was pulled to the boundary ropes by Ansari.
With the floodlights still on, Davies brought up the hundred by despatching Smith to mid-wicket, followed two overs later by a sparkling square drive through the off-side. Shortly afterwards, the obdurate Ansari edged Wagg just in front of the slip cordon before Davies completed his fifty from 100 deliveries by forcing Allenby through the covers.
Dean Cosker's spin was introduced after 49 overs as the fourth wicket pair continued to consolidate with their century stand coming up after two and a half hours of watchful application
Five balls later, 156/4 became 158/5 as Hogan struck again with Gary Wilson shouldering arms and departing l.b.w. With Jason Roy as his new partner, Ansari unleashed a coruscating cover drive en route to a 183 -ball fifty, before the umpires brought the plays off because of the deteriorating light. It started to rain soon afterwards and play was called off shortly before 6pm.