The Portguese, ranked 125th in the world, downed sixth seed Del Potro 7-6 (7-0) 6-4, while Raonic was also a straight-sets winner, defeating Denis Istomin 6-4 6-3 in France.
Jo-Wilfried Tsonga needed three sets to see off Carlos Berlocq, the second seed eventually winning through 6-7 (2-7) 6-2 6-3.
He will meet Karen Khachanov following the Russian’s 6-2 7-6 (7-3) triumph over Jordan Thompson.
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