Italians are due to vote for the second and final day in key local election run-offs seen as a major test for embattled Prime Minister Silvio Berlusconi. The key battlegrounds are Berlusconi\'s home city of Milan and also Naples, where the centre-right ruling coalition risks losing power. The polls are being held in cities where no candidate won 50% of the vote in the first round on 15-16 May. Voting on Sunday and Monday involves some 88 municipalities and half a dozen provinces with around 6.5 million eligible voters. The polls are due to open again at 0500 GMT and will finally close at 1300 GMT. Some six million voters are eligible to cast their ballots. Results are expected within hours of voting ending. The elections are the first big test Berlusconi has faced since the start of his trial on charges of abuse of power.