Ledley all fired up to prove that the Welsh are no longer walkovers
Wales renew acquaintances with Serbia on Saturday, opponents who beat them 6-1 and 3-0 during the 2014 World Cup qualifying campaign.
Those games were the real low points of Chris Coleman's five-year reign, but Wales recovered from those heavy defeats to make the semi-finals of Euro 2016 in France last summer.
Midfielder Joe Ledley said: "We know they're a great team, we've played them a few times and lost before.
"But we've moved on from those results, we've proven how well we've adapted from those defeats.
"We had a fantastic time in the Euros and have shown how far we've come.
"If we carry on doing what we're doing then hopefully the results will come."
Wales are unbeaten in World Cup qualifying following their opening win over Moldova and back-to-back October draws against Austria and Georgia.
But Serbia have stolen a march at the top of Group D with their 3-2 victory over Austria last month taking them two points clear of Wales.
A lot rides then on Saturday's encounter at the Cardiff City Stadium.
"We can't afford to let them get away from us any further," Crystal Palace ace Ledley said.
"They are doing well in the competition at the moment and we're still undefeated, so we need to be on the front foot.
"The Euros are over now and our concentration is on the World Cup.
"That's what we've got to aim for, it is down to us to get a result."