Seixas has been in the top 10 overall since the opening stage in Barcelona two weeks ago, but he has gradually snared a few seconds here and there from his rivals for a podium finish in Paris.And on Saturday, his third place finish on the mountainous 155km stage from Mulhouse to Le Markstein Fellering allowed him to leapfrog Juan Ayuso into fourth, and snatch the best young rider's white jersey from the Spanish 23-year-old. "It's incredible, it was marvellously tough, another very difficult stage, we're starting to get used to them," said the 19-year-old Tour debutant."I really enjoy this, I trained really hard for this."It's a great pleasure to have the white jersey and to still be in the running for the podium."He even earned himself a pat on the back from four-time champion Tadej Pogacar at the finish.At one point on the final climb up the Col du Haag, it looked as though Seixas would even take third place from Olympic champion Remco Evenepoel.But the Belgian finished strongly on the rapid 6km run to the line to keep that position, although Seixas is only 15 seconds behind him now, with another tough mountain stage to come on Sunday."That gives me even more confidence for what's to come, although there is a long way to go and the toughest is yet to come," he said."The general classification is the most important thing but it's great to have this jersey."