 His most successful seasons with Daugava were in 1979 (10 goals) and 1981 (16 goals), but later in the career his performance declined.In different stages of his career Semjonovs also played on different positions on the field - he started as a forward but also sometimes played in defense and as a half-back.After the end of playing on a professional level Semjonovs played football on amateur level in Riga, went on to coaching (worked with the Latvia U16 national football team) and founded a sports club.