Advertising giant WPP said a stabilisation and subsequent growth in revenue came earlier than expected.Reported revenues were £2.078 billion in the first quarter, down just under 2% from last year. Revenues in constant currency were up 0.5%, reflecting the strength of the pound sterling against the US dollar and Euro. On a like-for-like basis, excluding the impact of acquisitions and currency fluctuations, revenues were flat with last year. Revenues have stabilised following declines of 5.8% in the same quarter last year and 7.2% in the last quarter of last year and over 8% last year. The first quarter saw sequential improvements each month, with March up 1%, the first monthly revenue growth for 14 months since December 2008. "We are in the process of reviewing our quarter one revised forecasts, but early indications are that the improvement in revenues, compared with budget, seen in the first quarter, will continue for the balance of year, with full year like-for-like revenue growth of around 2%," said the group."In the rest of 2010, the focus will be on ensuring that the benefits of the stabilisation in revenues, and the significant cost actions taken during 2009, are reflected in operating profitability. It is too early to say whether this stabilisation in the first quarter and the growth in March will be sustained.""The second quarter should continue the trend, if only because the comparatives are easier, since second quarter revenues in 2009 were down almost 11%. Revenue stabilisation and growth have certainly come earlier than expected in 2010, as we originally thought growth would only come in the second quarter," it added.