Metropolitan Magistrate (MM) Sudesh Kumar had on October 16 reserved his order for tomorrow on whether to summon Singh as accused in the complaint after recording the statements of two witnesses of the complainant.
Gadkari has filed the criminal defamation case against Singh, who has accused him of having business links with his party MP Ajay Sancheti who allegedly pocketed Rs 500 crore in the coal block allocation.
The court had earlier recorded the statement of Gadkari and BJP National Secretary Bhupinder Yadav, also a Rajya Sabha MP.
Gadkari, in his statement recorded in the court, had denied having any business ties with Sancheti and had said Singh had levelled "totally false and defamatory" allegations against him to "give the impression that I have been responsible for allocation of coal mines" to Sancheti.
In his petition, filed through advocate Ajay Digpaul, Gadkari has sought Singh's prosecution under sections 499 (defamation) and 500 (punishment for defamation) of the IPC.
In his complaint, Gadkari had said that the Congress-led UPA government is facing a lot of heat on account of its irregularities as brought out by the Comptroller and Auditor General of India (CAG) in coal blocks allocation and accused Singh of making baseless allegations against him to divert attention.