It is narrated from Sayyidah Aishah (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) used to give only one salam in prayer, turning his face slightly to the right side.
Zuhayr bin Muhammad is alone in narrating it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2985