Surrey completed their fourth LV= County Championship Division Two victory of the season beating Glamorgan by nine wickets on the fourth evening at Colwyn Bay.
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It was a victory that keeps the pressure up on the top two - Worcestershire and Hampshire.
The visitors were indebted to four wickets for Matthew Dunn and a two-over burst from part-time seamer Arun Harinath who claimed two key wickets in short order.
Glamorgan had started the day facing an uphill struggle to save the game, resuming on 182 for two and still needing 175 more to make Surrey bat again.
They did at least manage that, bowled out for 398 after Chris Cooke made an unbeaten 83, leaving Surrey 42 to win from the remaining 25 overs. The visitors reached their target with 12.1 overs to spare.
They lost an early wicket but it mattered little as they bagged 23 points from their third win in four games. Glamorgan, who went down to a second consecutive defeat, had to make do with only two points.
Murray Goodwin and Ben Wright, who had come together on the third evening, continued their bid to save the match in the morning.
The breakthrough came when Dunn switched ends to the Penrhyn Avenue end, trapping Goodwin lbw and leaving the hosts on 224 for three - still 133 runs adrift. Goodwin and Wright shared in a partnership of 62.
Cooke joined Wright who was Dunn's next victim two overs later going the same way as Goodwin to put Surrey on a charge.
Jim Allenby and Cooke slowed their moment, looking relatively comfortable against the all spin attack of Gareth Batty, who had claimed the two wickets to fall on Tuesday evening, and Zaraf Ansari.
Surrey took the second new ball immediately with Glamorgan 270 for four but Allenby and Cooke survived until lunch.
Glamorgan suffered a blow only five balls after the interval when the in-form Allenby edged the productive Dunn to Rory Burns at third slip to leave the hosts on 285 for five.
But the resistance continued in the form of Cooke, who went to his 50 from 118 balls, and captain Mark Wallace.
In the 108th over Glamorgan ensured Surrey would have to bat again as they reached 357 for five.
But in the next over part-time bowler Harinath claimed two wickets in the space of an over to record figures of 2-1-1-2.
He grabbed a crucial breakthrough when Wallace attempted an expansive drive and was caught behind. Wallace went for 30 ending a 73-run partnership with Cooke.
That was followed only four balls later with the wicket of Ruaidhri Smith who Harinath dismissed pinning back his off stump.
Glamorgan reached tea at 375 for seven, an overall lead of 18 with 32 overs of the contest remaining.
But it took Surrey only two balls after tea to remove Will Owen, caught by Chris Tremlett running in at mid off off Dunn, who finished with four wickets, before Dean Cosker was stumped off Ansari.
The innings came to an end a further two overs last when Ansari got through Michael Hogan's defences. It meant Glamorgan lost their last three wickets in the space of 23 balls.
The only setback of the Surrey second innings was when Burns pulled Will Owen straight to Hogan at mid-on before Ansari and Harinath took Surrey across the winning line.