Glamorgan were 80/3 when bad light ended play on the third day of their rain-affected LV=County Championship match against Gloucestershire at the SWALEC Stadium, with the Welsh county still trailing the visitors by 6 runs.
His shrewd efforts, supported by some smart catching, restricted Gloucestershire to a lead of just 85 on a day when thirteen wickets tumbled, with his wily and unbroken spell of 5/46 from 22 overs was also his best-ever return in the early part of the season with all of Cosker's previous "five-fors" for the Welsh county having been recorded between June and September.
After heavy overnight rain, there was plenty of surface water on the protective sheets, and after an initial inspection, the umpires decided that a further inspection would take place at 12.30pm.
Facing a deficit of 86 runs, Gareth Rees and Will Bragg opened Glamorgan's second innings as Will Gidman and James Fuller shared the new ball. Gidman again beat the outside edge of Rees' bat with his probing seam bowling, although the opener played some deft flicks off his legs to get the scoreboard moving. Bragg once again showed exemplary judgement of his off stump, leaving a series of deliveries alone as light rain started to fall over the Stadium again.
Bragg unfurled a firm off-drive against Fuller before steering Gidman through backward point for four. Rees also struck an early boundary as he clipped Fuller to deep square-leg before steering Gidman to the ropes at wide third man. The drizzle started to intensify and with the light deteriorating, the umpires took the players off the field shortly before 3.45pm for an early tea,
Two balls later, 27/1 became 27/2 as Stewart Walters was clean bowled by Fuller before Will Bragg got the scoreboard moving by leg-glancing Will Gidman but in his next over the all-rounder claimed the prized scalp of Jacques Rudolph as, after switching to around the wicket against the left-hander, he induced an edge down the leg-side with Herring completing his second tumbling catch.
36/3 saw Murray Goodwin join Bragg with the Zimbabwean opening his account by off-driving Fuller for three. Tom Smith's left-arm spin was then introduced at the River End as sunshine bathed the Stadium whilst Matt Taylor switched to the Cathedral Road End. Goodwin twice cover drove the latter before Bragg clipped him through mid-wicket as they continued to chisel away at the deficit.
The spinner nearly had Bragg caught at bat-pad before Gidman returned and was glanced to long-leg as well as being cover driven by Goodwin. The light though deteriorated and at 6.15pm the players left the field with play being called off a quarter of an hour later.