It was the 4th stage of the 2009 edition, Fléron to Fléron. But it was only a surprise for those who didn't really know him because he already showed in the U23 he could perform on the road (8 wins out of the 10 he started, or something).
That day, he was in the morning breakaway cought by the leaders but hung up and could still attack in the last climbs. I still remember the great battle with Lars Anthonius Boom.
De Waele won because Niels had a mechanic in the sprint. Definitely the best race to watch, that season.
After that he would go on winning the prologue of the Boucles de la Mayenne, top10 the Circuito Montañes (if I'm not mistaken) and winning the Tour of Alsace (+ stage on the Ballon d'Alsace), that year.
We've never seen such a great Albert on the road, since then.
In 2008, while he was still racing for Paelmans, he was again in the morning breakaway of the queen stage of the Tour (of Belgium) and passed the Mur de Huy, alone ahead but then he dropped out, while Nys could catch the main group (with no road race in his legs before).