Wales took another step towards the Rugby World Cup quarter-finals, but they were given a fierce examination by minnows Portugal before winning 28-8 at Stade de Nice.Warren Gatland's much-changed team struggled throughout for control and fluency in the Pool C contest, the highlight of which was Portugal’s attacking flair.Wales started with only three survivors from the side that defeated Fiji last weekend, and their latest performance was a world away from what they delivered in Bordeaux six days ago.Wing Louis Rees-Zammit, captain Dewi Lake, flanker Jac Morgan and number eight Taulupe Faletau scored tries, while Leigh Halfpenny kicked three conversions and Sam Costelow landed one, yet a vast improvement will be required against Australia in Lyon next weekend.Portugal gave as good as they got for large parts of the game, and they undoubtedly deserved more than flanker Nicolas Martin’s try and a Samuel Marques penalty, with Wales not collecting a bonus point until the dying seconds.Their exciting back division stretched Wales’ defence in all directions, although wing Vincent Pinto blotted the copybook when he was red-carded late in the game following a bunker review after his boot caught Josh Adams in the face.Wales suffered an injury blow shortly before kick-off when flanker Tommy Reffell withdrew from the starting line-up and was replaced by Morgan.Portugal, playing their first World Cup game for 16 years, were captained by centre Tomas Appleton and under the coaching direction of former France international wing Patrice Lagisquet.Marques missed a golden chance to put his team in front when he sent a short-range penalty wide, and Wales went ahead through a ninth-minute try that saw an impressive finish from Rees-Zammit.