Mathematics of bookmaking

Bookmakers in Serbia say the odds are heavily in favour of the Prime Minister and head of the ruling Serbian Progressive Party, Aleksandar Vucic, winning the presidential election.

The chances of him winning outright in the first round are slightly lower than his chances of winning in the second round, however, they said.

Growing nerves over Greece have been the talk of financial markets for the past week, but online betting firms see only around a one-in-five chance it will leave the eurozone this year -- a lower likelihood than earlier this year.