Mikhailova and Sergeev won silver at the 2006 World Junior Championships. They changed coaches in September 2006, moving from Ksenia Rumiantseva and Petr Durnev to Alexander Zhulin.
At the 2006 World Junior Championships, Mikhailova and Sergeev secured a silver medal. In September of that year, they transitioned coaching staff, changing from Ksenia Rumiantseva and Petr Durnev to Alexander Zhulin.