French teenager Seixas becomes youngest Fleche Wallonne winner
Seixas beat home Switzerland's Mauro Schmid and British rider Ben Tulett to replace Philemon De Meersman in the race's history books as the Belgian was 21 years old and 150 days when he won in 1936.
It was the dream preparation for an altogether tougher task in facing Slovenian great Tadej Pogacar, who was absent, at Liege-Bastogne-Liege on Sunday.
Pogacar, a two-time winner of the Fleche Wallonne, could only finish 53rd on his debut in the race in 2019.
"It is unbelievable, this is a huge victory," said Seixas.