|1994 Helsinki||Long jump|
He was born in Vratsa and represented the club CSKA Sofia. He finished sixth at the 1991 European Junior Championships and wn the bronze medal at the 1992 World Junior Championships. He finished sixth at the 1993 World Indoor Championships, fifth at the 1993 World Championships, and second at the 1993 Grand Prix Final. In 1994 he finished fourth at the European Indoor Championships and won the European Championships.
He then finished eighth at both the 1995 World Championships and the 1995 Grand Prix Final. At the 1995 Military World Games he took a bronze medal. He did not reach the final at the 1995 World Indoor Championships or the 1996 Olympic Games. At the 1996 European Indoor Championships he qualified for the final, but did not start that. He competed at the 1999 World Championships without reaching the final.
- "Ivaylo Petkov Mladenov". Sports-Reference.com. Archived from the original on 19 May 2011. Retrieved 12 July 2011.
- Peters, Lionel; Magnusson, Tomas. "European Junior Championships 1991". World Junior Athletics History. Retrieved 12 July 2011.
- Ivaylo Mladenov profile at IAAF
- "1994 European Indoor Championships, men's long jmup final". Die Leichtatletik-Statistik-Seite. Retrieved 12 July 2011.
- "Men Long Jump European Championships 1994 Helsinki (FIN)". Todor Krastev. Retrieved 12 July 2011.
- "CISM Military World Games". GBR Athletics. Athletics Weekly. Retrieved 12 July 2011.
- "1996 European Indoor Championships, men's long jmup final". Die Leichtatletik-Statistik-Seite. Retrieved 12 July 2011.
- "Bulgarian Championships". GBR Athletics. Athletics Weekly. Retrieved 12 July 2011.
- All time best Balkan athletes, men - The Athletics Site
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