Aleksandar Kolarov knows that after victory in its opening World Cup match his Serbia lineup cannot ease off the intensity against Switzerland.
Two draws in its remaining matches could be enough to secure a spot in the round of 16 but with Brazil waiting in its last Group E game, beating the Swiss would take the pressure off Mladen Krstajic's team.
"If we do the math and start playing for a draw then it will not be successful," Kolarov said. "Of course we want to win."
The Serbia captain's precisely placed free kick in the 56th minute was the only goal in Serbia's victory over Costa Rica. Krstajic wants his forwards to step up another level against Switzerland on Friday.
Krstajic appears to be keeping faith in striker Aleksandar Mitrovic, who scored six goals in Serbia's World Cup qualification campaign but couldn't find the target against Costa Rica.
"I know his qualities, everybody knows his qualities," the coach said. "He lacked luck to score (against Costa Rica) but we are keeping him there for the forthcoming games."
Mitrovic is unlikely to have an easy day against a Switzerland defense and midfield that held Brazil to a 1-1 draw in its opening match.
Steven Zuber's powerful second-half header equalized for Switzerland after Philippe Coutinho's curling shot had given Brazil the lead.
One of the keys to Switzerland's success was midfielder Valon Behrami, whose tough tackling and marking of Neymar canceled out the threat of the world's most expensive player for most of the match against Brazil. He was eventually replaced because of a thigh muscle strain in the 70th minute.
Switzerland coach Vladimir Petkovic was relieved when tests showed no serious injury to Behrami, who became the first Swiss player to appear at four World Cups when he started against Brazil.