Incumbent two-decade ruler falls just short of a majority, but sits in a good position to win second round of voting on May 28 after his alliance retains hold on parliament

Retired civil servant leads an unprecedented opposition, pushing incumbent into a historic electoral duel that could potentially end his two-decade rule

If neither the incumbent nor his center-left challenger Kemal Kilicdaroglu receive more than 50% of the vote, the winner will be determined in a May 28 run-off

Turkish leader boasts of his government's achievements in speech to supporters, as country deals with surging inflation and currency's collapse