Wales' 2-1 win over Scotland last month has helped Chris Coleman's men up 22 spots in the World Football Rankings.
The team are now 49th, jumping ahead of Poland and Egypt despite their defeat to Croatia.
Scotland's loss saw them fall to 77th, whilst England slip to 7th, the Republic of Ireland rise to 39th and Northern Ireland fell to 119th.
The top three of Spain, Germany and Argentina remain unchanged.
Wales star Gareth Bale has travelled to Scotland and taken part in a training session ahead of tonight's game against Scotland.
The Tottenham player is expected to be declared fit to play after struggling to recover from an ankle injury.
The match will kick off a 8pm at Hampden Park in Glasgow, with Wales hoping to repeat the success of last October's clash when they snatched victory with a 2-1 win in Cardiff.
Chris Coleman has named his 23-man squad for Wales' match against Mexico at the end of the month. It's the first time the Wales manager has taken charge of picking the squad. Although already appointed, he decided to take a back seat for the Gary Speed Memorial match against Costa Rica in February.
Liverpool striker Craig Bellamy, 32, is included, a sign that he may continue his Wales career into the 2014 World Cup qualifying campaign. He'd previously admitted he was considering his international future after Speed's death.
Wales face Mexico in New Jersey, USA on 27 May, before qualifying begins in September, against Bosnia-Herzegovina.
Wales squad to face Mexico:
- J Brown, L Price, R Taylor; D Blake, N Eardley, C Gunter, A Matthews, S Ricketts, N Taylor, A Williams; J Allen, A Crofts, D Edwards, A King, J Ledley, A Ramsey, D Vaughan; G Bale, C Bellamy, S Church, S Morrison, H Robson-Kanu, S Vokes