Merlier doubles up as Van der Poel denied epic win at Tour de France
There was no change atop the overall standings with Tadej Pogacar now holding a 54sec advantage over Remco Evenepoel in second with French starlet Kevin Vauquelin third.
This was a second Tour win for Soudal Quick-Step sprinter Merlier this year, who was first across the line on stage three at Dunkirk.
Merlier was led in by team leader Evenepoel.
"It's mad, we are supposed to be helping him (Evenepoel) but he's helping us," Merlier said.
"I need to make it through the mountains now, I won't be any use to Remco there...