Mitakeumi has won the Autumn Grand Sumo Tournament after a playoff with fellow sekiwake Takakeisho.
The two wrestlers and rank-and-filer Okinoumi were tied with 11 wins and three losses after the 14th day.
On the final day on Sunday, Mitakeumi and Takakeisho, who both hold the third-highest rank, reached the playoff after beating their opponents.
This is Mitakeumi's second tournament title.
Mitakeumi had college and amateur sumo titles under his belt when he entered professional sumo in 2015. He advanced to the top Makunouchi division in less than a year, the second-fastest record since the early 20th century.