Andrej Sekera's goal late in the first period proved to be the deciding tally, as Slovakia toppled the United States, 4-2, in Monday action at the 2012 World Championship.
Dominik Granak and Branko Radivojevic also scored in the first period for Slovakia, which was coming off a 1-0 loss to defending-champion Finland.
Jan Laco stopped 18-of-20 shots.
Paul Stastny and Justin Faulk lit the lamp for the Americans, who fell victim to a classic trap game after an emotional 5-4 overtime victory against Canada.
Jimmy Howard allowed three goals on 31 shots in defeat.
Stastny brought the USA to 3-2 with 1:13 remaining in the second, but Miroslav Satan provided his country with a valuable insurance goal into the empty net.
Earlier in the day at Hartwall Arena, Patrick Sharp notched a goal and four assists as Canada shook off that loss to the USA and dispatched France, 7-2.
Ryan Nugent-Hopkins and Jamie Benn each totaled two goals and a helper for the Canadians, who got 19 saves from Devan Dubnyk.
Corey Perry and Jordan Eberle added tallies for Canada, which next plays Switzerland on Wednesday.
Alexandre Rouleau and Brian Henderson scored for France, while Fabrice Lhenry was dented for all seven scores on 37 shots.
At Stockholm, Michael Frolik's marker before the eight-minute mark in the third period helped send the Czech Republic past Norway, 4-3.
Ales Hemsky scored twice and David Krejci also hit the net to back a 28-save performance from Jakub Kovar.
Jonas Holos and Mathis Olimb each registered a goal and assist for the Norwegians. Lars Haugen made 27 stops in the setback.
Sweden took a 6-4 decision over Denmark in front of its home crowd in the late contest from Globe Arena. Loui Eriksson and Viktor Stalberg each picked up a pair of goals and Johan Franzen added three assists.
Jhonas Enroth didn't play well to get the win, allowing four goals on just 18 shots.
Nichlas Hardt registered two goals and a helper, and Daniel Nielsen also lit the lamp for the Danes. Frederik Andersen allowed all six goals on 42 shots.