Geneva police had to break up fights outside a polling station set up for Brazilians on Sunday.
Some supporters of the two candidates came to blows.
Although there were no arrests, witnesses say the atmosphere was tense.
The result from the Geneva poll showed the race was virtually neck and neck.
The contender, Lula da Silva beat the incumbent Jair Bolsonaro by just 52 votes out of a total of nearly 4,000 cast.
Geneva could foot the G7 bill
Geneva fears it will be left with the security bill from a G7 summit just across the border in Évian, according to 24 heures.
US NGO discovers Swiss child abuse cases
Switzerland relies too heavily on an American NGO to detect child sexual abuse online, raising questions about the country's ability to protect children on its own.
French singer banned by Paleo
The Paléo Festival in Nyon says it will no longer invite French singer Patrick Bruel, after a former volunteer accused him of inappropriate behaviour.
Cars going uninspected
The cantons are struggling to keep up with mandatory vehicle inspections, leaving more than 550,000 checks overdue nationwide.
War may lead to rent rises
Rents may rise again, says the bank Raiffeisen.
Not a heatwave, yet
Summer has arrived, with temperatures climbing past 30 over the long weekend. Basel reached 31 and Sion hit 32.4, but MeteoSwiss, says this does not yet count as an official heatwave.
