Polls indicate that the only questions were whether Orban, 50, can retain his two-thirds parliamentary majority and if the far-right Jobbik might beat the wobbly centre-left opposition alliance into second place.
"I know we are favourites," Orban said at a final rally yesterday.
"But the match starts at 6:00 am (0400 GMT) with the score nil-nil. What matters is what happens between 6:00 am and 7:00 pm."
Surveys in 10-million-strong Hungary put the Fidesz party, created by Orban and other like-minded young student liberals in the dying days of Communism in the late 1980s, on 46-51 percent.
Orban has made most of the super-majority he won in 2010, with a legislative onslaught shaking up everything from the central bank to the constitutional court in the EU member state.
The fate of the media has sparked particular alarm abroad, with state outlets merged into one tame entity, independent publications starved of advertising and all under the close eye of a new watchdog.
Many of these reforms have been written into a new constitution, meaning that even if the opposition were to win, it would need a two-thirds majority to change them.
Orban says the changes are aimed at turning Hungary into a "race car" after eight years of economic and political Socialist mismanagement had reduced it to an "old banger".
In addition he has claimed credit for an improving economy, with Hungary having repaid an emergency IMF loan, the recession over and unemployment and inflation down.
But this too is a sham, critics say, with nationalist rhetoric and unorthodox economic policies scaring away foreign investors while lining the pockets of his cronies.