Gastao Elias of Portugal stunned top-seeded Gael Monfils 7-6 (7-4) 6-1 in the second round of the Stockholm Open on Thursday.
Elias booked a slot in the quarter-finals against Jack Sock of the US, who edged Dustin Brown of Germany 7-6 (7-5) 4-6 6-4.
Ranked 61 in the world, Elias saved four break points against the seventh-ranked Monfils. He celebrated the win by jumping into the air like Portuguese soccer star Cristiano Ronaldo.
No. 2-seeded Grigor Dimitrov also advanced by beating Jurgen Zopp of Estonia 6-3 6-2 and will face Kevin Anderson of South Africa in the quarter-finals.
Anderson saved two set points in the first set to defeat Ryan Harrison of the U.S. 7-6 (8-6) 6-4.
Juan Martin del Potro set up a quarterfinal against Ivo Karlovic by beating Nicolas Almagro of Spain 3-6 7-6 (7-1) 6-3.
