Much of the local pre-match attention was focused upon the duel between Real Madrid's Gareth Bale and Barcelona's Luis Suarez lining up in opposing attacks, but Cavani proved the difference maker with his 42nd international goal.

Suarez hit both posts during an absorbing and open first half, leaving his long-time international strike partner Cavani to settle matters in the 49th minute with a far simpler finish than his spectacular semi-final overhead kick against Czech Republic.

Bale and Wales, who thrashed host China 6-0 to book a spot in the final of the invitational tournament, were unable to muster a response as their second outing with Ryan Giggs as manager became a little ragged after half-time.

An early injury to Atletico Madrid defender Jose Gimenez proved the only setback for Uruguay and their veteran boss Oscar Tabarez, who open their World Cup campaign against Egypt on 16 June (AEDT).

Bale and Suarez shared a warm embrace in the tunnel beforehand and the latter superstar almost gave Uruguay a second-minute lead when he fired Nahitan Nandez's cut-back against the base of the left post from 10 yards.

Wales also asked early questions, with Sam Vokes sweeping Harry Wilson's teasing cross into Fernando Muslera's grateful arms.

Using Bale's cross-field balls proved a fruitful ploy for Giggs' men initially but he erred in the 14th minute and, from the resulting Uruguay attack, Cavani was unable to apply the decisive touch to Suarez's inviting cross.

There was another let-off for Wales after the half hour when Suarez seized upon a woeful back-pass from Ashley Williams and rounded goalkeeper Wayne Hennessey. The right-hand post denied him on this occasion.

Hennessey then pushed over a rasping hit from Cavani, who headed wide from the resulting corner.

It was far from one-way traffic, with Muslera forced to palm Andy King's sweetly struck 25-yarder to safety before an even better stop kept out Bale's glancing header from Wilson's free-kick in first-half stoppage time.

Uruguay found the breakthrough in simple and clinical fashion, punishing their opponents' lacklustre resumption after half-time.

Wales' defence was caught out by Diego Godin's lofted pass in behind for Cristian Rodriguez, whose low cross left Cavani with a routine finish.

A similarly straightforward chance should have seen Cavani put the result beyond doubt four minutes later, but the Paris Saint-Germain star misjudged a centre with a touch more pace from Guillermo Varela.

Suarez fired home from a Cavani lay-off before the hour, only to be correctly flagged offside, and although Wales' defence was increasingly cut open at will, they still carried a threat in attack.

Muslera was relieved to see King's deflected drive squirm wide in the 73rd minute as he stood rooted to the spot following probing work from Bale, who would ultimately find no way of adding to his semi-final hat-trick.