Sa'id bin Jubayr (may Allah have mercy on him) said: The Messenger of Allah (peace and blessings be upon him) was at a place called al-Batha' when Yazid bin Rukanah, or Rukanah bin Yazid, came to him (peace and blessings be upon him). He had some goats with him. He said: "O Muhammad (peace and blessings be upon him), will you wrestle with me?" He (peace and blessings be upon him) said: "If you lose, what will you give?" He said: "A goat." He (peace and blessings be upon him) wrestled him, threw him down and took a goat. Rukanah said: "Again." He (peace and blessings be upon him) said: "If you lose, what will you give?" He said: "Another goat." This happened several times. He said: "O Muhammad, no one has ever put my back to the ground, that is, thrown me, yet you have thrown me." He became a Muslim, and he (peace and blessings be upon him) returned his goats to him.
It is a good mursal (report missing the Companion); it has also been narrated connected through another chain, but that chain is weak. And Allah knows best.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السبق والرمي / 19761