Federer is 18-6 in his career against del Potro, with two of the losses coming at the U.S. Open, in the 2009 final and last year's quarterfinals.
In the women's semis on Friday night, Venus Williams was to meet Daria Kasatkina of Russia and top-ranked Simona Halep of Romania faced Naomi Osaka of Japan.
Oeiras (Portugal), May 4: Top-seeded Juan del Potro continued his impressive form at the clay-court Estoril Open with a 6-2, 6-2 victory over seventh-seeded Albert Montanes to reach the semifinals.Del Potro, who hadn't played a
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