Ivo scored twice for Portugal and set up another as Helio Sousa's side weathered a torrential downpour to comprehensively outclass Asian champion Qatar.
Qatar, which must now win its final Group C match against Senegal to stand a chance of qualifying, rarely threatened, although it did carve out the first chance of the match.
That came in nine minutes when Portugal keeper Andre Moreira unconvincingly gathered at the second attempt after Ahmed Alsadi had raced through on to an accurate long ball and shot weakly.
Possession was dominated by the Europeans but it took patience for their probing to pay off, with 34 minutes having elapsed before they took a deserved lead.
Andre Silva was the scorer, ghosting in unmarked to steer home an inch-perfect inswinging cross from Gelson Martins, who had drifted in cleverly from the right. It was a fine goal but nothing in comparison to the spectacular strike that doubled Portugal's lead soon after, as Ivo took centre stage.
Qatar's failure to clear the lines was punished in superb style, with the Vitoria Guimaraes youngster adjusting his body to meet Chico Ramos's looping header and send an acrobatic overhead kick beyond the helpless Yousof Hassan.
Ivo continued to shine as the match progressed and on 66 minutes doubled his tally, climbing powerfully at the back post to direct a downward header through the legs of Hassan.
And he wasn't done yet because, with 16 minutes remaining, the winger helped complete the rout with an impressive assist. Nice skill, along with a little luck, took him past his marker on the right and his cutback was swept first-time into the roof of the Qatari net by subsitute Joao Vigario.
A dramatic stoppage-time free kick from Kevin Gutierrez saw Mexico snatch a 2-1 victory over Uruguay to put El Tri back on track in Group D.
Hirving Lozano capitalised on poor defending to put the Mexicans ahead before Mathias Suarez's late equaliser looked to have left the eventual victor struggling to reach the last 16.
However Gutierrez's last-gasp strike drew it level with its South American opponent on three points.
Colombia also inched towards the last 16 with a point against Senegal in a later game.
The Colombians know that they should have left with more than the 1-1 draw and already be secured a place in the knockout stages.
The African side was better in the early exchanges and got its just reward thanks to a fine goal from Mamadou Thiam, but Alexis Zapata ensured Senegal stayed ahead of its opponents in Group C with an equaliser from the penalty spot.
Serbia saw off Mali for a 2-0 win, courtesy of a superb first half free kick by Sergej Milinkovic and a close-range effort from substitute Stanisa Mandic.
The result left Group D wide open going into the final round of fixtures.
