Career
Mladenov started from small teams like Dimitrovgrad and gradually moved to bigger teams like. From there he went all around the world, however his best moments of winning were in Portugal and also with his National Team. His best years were spent as a striker foreign
He also served the club as a manager and head coach.
Mladenov"s finest game as a player was on 17 March 1982, when he scored both of CSKA"s goals as they beat Liverpool 2-0 in Sofia to knock the English giants out of the European Cup quarter-finals. He was honoured as Bulgarian Football player of the Year in 1983.
Nowadays he trains the most successful Bulgarian team Financial problems at his favourite club pushed him away after a series of compromises he had done during his time there.
In his initial stint at (between 2002 and 2003), Mladenov led the team to its first A PFG title in 6 years.
In March 2012, he replaced Dimitar Penev as head coach of and led the team to a second-place finish during the 2011/2012 A PFG season. On 4 January 2013 Stoycho Mladenov was sacked by - he was at for the third time as manager of the club On 16 July 2013 Stoycho Mladenov was reappointed by - this was his fourth time at.
He resigned in March 2015 despite the successful season for the team, which was able to pose a challenge to Ludogorets Razgrad for the title.
On 20 March 2015, Mladenov officially resigned as manager of once again. Mladenov made 59 appearances for Bulgaria, between 1978 and 1988, and scored 15 goals.
He played in four matches for his country at the 1986 Fédération internationale de football association World Cup. Player Individual Coach.