Voting officially ended across Ghana Saturday at 17:00 GMT after the country's Electoral Commission (EC) extended Friday's polls by a day as a result of constant breakdown of biometric verification devices (BVDs), while some provisional results showed tight presidential race Ghana's incumbent President Mahama and main opposition leader Akufo-Addo.

EC decided late Friday to allow the affected eligible voters and those who had queued up Friday but were unable to cast their ballot at the close of polls to exercise their franchise. But the number of polling centers across the country that took part in Saturday's voting were not disclosed.

A tour of some polling centers here as well as reports monitored on state television and radio indicated Saturday's voting went on devoid of the challenges that were encountered on day one of voting.

The Coalition for Domestic Election Observers (CODEO), ECOWAS, African Union (AU), European Union (EU), and Commonwealth Observer teams who are in the country monitoring the elections say no serious incidents had been reported.

Counting and collation of ballots are still underway in other areas that voted Saturday across the country.

A tight race is showed between the two main presidential candidates - incumbent President John Dramani Mahama and main opposition leader Nana Addo Dankwa Akufo-Addo from New Patriotic Party (NPP).

According to Joy fm, a private local media, John Dramani Mahama of the ruling NDC has so far garnered 3,045,228 votes, representing 50.63 percent, while Akufo-Addo gained 2,878023 votes or 47.85 percent of the total votes based on the voting results from 160 out of a total of 275 constituencies.

The NDC manifesto, under its "Still Better Ghana Agenda", is based on four thematic areas of transparent and accountable government, strong economy for real job creation, investing in people and expanding infrastructure for growth. However the NPP's major campaign slogan of "FREE SHS (Senior High School)" promises to provide free Senior High Education to all school going kids.

Some political analyst here said a second round is possible based on current situation. If no candidate wins an outright majority-of 50 percent plus one vote in the first round, then a second around presidential race is needed after 21 days of the poll.

Ghana has seen five elections since military rule ended in 1992 but analysts say the stakes are higher than ever as commercial production of oil that began in 2010 is expected to expand.

As a top exporter of cocoa and gold, Ghana is one of the world's fastest-growing economies in the world, recording a growth of 14 percent in 2011.

Experts have predicted a growth of eight percent for 2012 and 2013.