By Lisandra Paraguassu, Brendan O'Boyle and Luciana Magalhaes

SAO PAULO, Oct 25 (Reuters) - Brazilian President Luiz Inacio Lula da Silva won a historic fourth term on Sunday, the country's electoral court said, in a shock result that defied polls, precedent and global anti-incumbent sentiment to put the brakes on a wave of right-wing election victories across Latin America.

However, his opponent Senator Flavio Bolsonaro, the eldest son of former President Jair ‌Bolsonaro, refused to accept defeat and said he would ask for the result to be annulled due to a Sunday ruling from a Supreme Court justice that extended voting for two hours.

Bolsonaro led the election's first ‌round but lost in the runoff by over 4 million votes, rattling Brazilian financial markets which had bet on his victory. His refusal to concede defeat has echoes of his father's reaction after losing to Lula in 2022. Jair Bolsonaro ...