So proud of Wolves as a much-changed side held on to stun Liverpool and reach the FA Cup fifth round with a deserved victory at Anfield. Richard Stearman put the visitors ahead after only 53 seconds, left unmarked to head in Helder Costa''s free-kick to send the 8300 travelling fans into ecstasy. Costa then set up Andreas Weimann to round Liverpool keeper Loris Karius and double Wolves'' lead before the break. Divock Origi scored late on to set up a frantic finale but a largely subdued Liverpool failed to find an equaliser. Liverpool have now won just one game in eight in January, with the Reds reliving recent mistakes as they failed to break down an organised team while also showing crippling defensive frailty. Their weakness at the back was exposed inside the first minute, the hosts conceding a free-kick on right for the left-footed Costa to swing in a dangerous cross, with Origi and Georginio Wijnaldum failing to pick up Stearman, who easily headed in at the back post. The other symptom of Liverpool''s January blues was also apparent as they dominated territory and possession but could not unpick a well-drilled Wolves defence, the previously free-scoring Reds having managed only six goals in those eight games. Indeed, it took until 59 minutes for the hosts to have a shot on target, substitute Philippe Coutinho drawing a straightforward save from Wolves'' 20-year-old goalkeeper Harry Burgoyne, making only his third senior appearance. Trying to find some attacking fluency, Klopp also sent on Daniel Sturridge, with the England striker showing composure to steer the ball back across the box late on for Origi to fire in, but it ultimately proved in vain. If Wolves'' first goal was a targeted attempt to terrorise Liverpool at set-pieces, the second was an exquisite example of how to catch out an inexperienced defence on the counter-attack. Wolves defender Matt Doherty played a quick pass up to Costa after yet another Liverpool attack broke down, the Portuguese racing away and holding off Alberto Moreno to slip in Weimann, who showed a deft touch to calmly round Karius and score. The hosts even had advance warning of both Wolves'' counter-attack capabilities and Costa''s pace after the on-loan Benfica winger had surged from his own area on a brilliant run, only to scuff his shot. As a point of comparison, when Liverpool had their own chance to break with numbers, left-back Moreno played a woeful pass straight to a Wolves defender with Origi clear through. Wolves boss Paul Lambert is keen to make Costa''s loan move permanent yet the 23-year-old may have other suitors after an impressive display. For long periods, Wolves executed a press that Klopp would be proud of, while they were resolute in defence led by on-loan Fulham defender Stearman, who also played in the visitors last victory at Anfield, a 1-0 win in December 2010. That organisation, coupled with the pace of Nouha Dicko and Costa up front should make Wolves a tough proposition for whoever they draw in the fifth round.