Atiku scored 1532 votes to defeat his closest opponent, Aminu Tambuwal, who polled 693 votes.
Speaking at the PDP Convention, Saraki described the primary election as free and fair, while commending the National working committee of a peaceful exercise.
He assured Atiku of victory and his support in the forthcoming 2019 election.
Saraki said: “Today is a great day for this party, because it has shown that the interest of this country is more important than our individual interest
“On behalf of other presidential aspirants, I thank Chairman of NWC, Governor Okowa for putting in place a transparent election and showing that PDP can make it right.
“I congratulate Atiku Abubakar, It has been a journey which you truly deserve, on behalf of all us we congratulate and assure you that we are here to work with you.
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“Just call on us to bring success to this part
We all know this is what Nigerians are yearning for and we can see truly
“All the doubting Thomases that thought we would all walk out after the results have been announced ,we are not going anywhere but walking with Atiku to victory.
“We are with you and confident that with us as a team May 29 2019 will be a day that our party will take over.
“We also thank our delegates as today’s event is not surprising.”