London, MAY 15: Brazilian Rubens Barrichello says Ferrari needs to watch out for Williams at next week`s Monaco Grand Prix. "We should remember that last year, Williams did not really get on the pace until they won in Monaco," he said. "So we should definitely not discount them and now it is clear that, in terms of pure speed, BAR are the closest to us, with Williams and Renault not too far behind.” Colombian Juan Pablo Montoya won in Monaco last year, ending a 20-year barren streak for Williams in the Mediterranean principality. That set the BMW-powered team on the road to recovery with three wins in the next five races after a disappointing start to the year. By August they were looking favourites for both titles ultimately claimed by Ferrari and Michael Schumacher, who has won the first five races of this season in a record-equalling start that could continue for some time. Bureau Report