DURHAM'S lightweight attack struggled to capitalise on Nicky Peng's first-day century and they were left in a vulnerable position by Mark Wallace's unbeaten 94.

Glamorgan closed the second day on 331 for six, only 24 behind, and if Wallace adds substantially to his score, Durham could find themselves in trouble on a pitch expected to turn more as the game progresses.

For the second successive day a wicket fell off the penultimate ball, Graeme Bridge claiming his third victim - all resulting largely from low bounce - when Robert Croft was lbw to end a stand of 86.

Like most of the others tipped as potential successors to Alec Stewart, Wallace does not look a good enough wicketkeeper to take on the England job.

But he is certainly a useful left-handed bat and made hay in the evening sun at Sophia Gardens as Durham wilted in the heat.

Durham were mighty relieved to get rid of Matthew Maynard in full cry as Glamorgan's former captain, dropped on 12 by Vince Wells off Nicky Phillips, went on to make 70.

The game rapidly slipped away from Durham after tea, when Glamorgan were 191 for four after 71 overs with Maynard on 44 and Wallace 11.

Jon Lewis gambled by introducing Michael Gough and brought back Mark Davies at the other end, but it backfired as they simply allowed Maynard and Wallace to switch into overdrive.

After Maynard pulled and drove Gough for two fours in his second over, Phillips was recalled only for the former England batsman to hit him for three fours in an over.

Suddenly Durham were under pressure.

Bridge replaced Phillips, but he could not stem the flow either, while Davies managed a series of dot balls only by bowling well wide of off stump to left-hander Wallace.

Glamorgan had added 54 in nine overs when Maynard shaped to play Bridge to leg and was pinned lbw.

Davies continued with the same line to Wallace and posted two gullies, only to see him slice one shot straight between them to reach 50 with his ninth four.

Durham's remaining two wickets added only two runs in the morning, Croft taking the last one to finish with six for 98.

Hopes that one of the Durham spinners could emulate him were high as Bridge and Phillips caused problems in the last 15 minutes before lunch.

They had Adrian Dale and Mike Powell in trouble with good bowling, with Powell surviving a leg-side stumping chance off Bridge while Dale was very close to lbw when shouldering arms to Phillips.

But both batsmen seemed to be playing more comfortably on the resumption until Phillips had Powell well caught one-handed off bat and pad by Peng.

The off-spinner should also have had Maynard off a top-edged sweep, to which Wells got both hands but was unable to hang on.

Maynard had swept impressively to that point, but the lapse prompted him to help the equally experienced Dale in wearing the spinners down.

They probably realised there was little other threat in the Durham attack.

Wells was on for the 12th over of the innings, but was removed after three innocuous overs.

Neil Killeen had an early success when left-hander Jimmy Maher sliced a catch to Gary Pratt at point, but Killeen and Davies are too similar to form a potent new ball attack.

Davies was unlucky when Jon Hughes edged him just wide of the slips, but the opener fell in Bridge's second over when another ball of low bounce hit his off stump.

Dale's painstaking 66 surprisingly ended when he chipped Phillips low to Pratt at mid-wicket, but the off-spinner was continually clipped through mid-wicket by Wallace in a dispiriting final session.

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