Maskaev kept Okhello backpedaling in the early rounds at Olympisky Stadium. Early in the 10th, he put Okhello in the ropes and later in the round battered him to a standstill with short shots to the head.
Maskaev was born in Kazakhstan when it was part of the Soviet Union, but has lived in the United States for a decade and is a U.S. and Russian citizen. President Vladimir Putin granted Maskaev Russian citizenship a day before the bout, reports AP.
The 37-year-old Maskaev (34-5, 26 knockouts) captured the WBC title in August with a 12th-round knockout of Hasim Rahman. Okhello, a 34-year-old Ugandan who lives in Japan, dropped to 18-8 with 16 KOs.