[2] Koltsov won the Russian Qualifying Event for the 2015 PDC World Championship and beat Haruki Muramatsu of Japan 4–2 in legs in the preliminary round.
[4] He teamed up with Aleksei Kadochnikov to represent Russia at the World Cup of Darts and they lost 5–1 to Australia in the first round.
[5] Koltsov's bid to reach the 2016 World Championship was ended at the semi-final stage by Aleksandr Oreshkin.
Oreshkin beat Kyle Anderson 4–2, but Koltsov failed to win against Simon Whitlock meaning a doubles match was required to settle the tie.
Russia easily won 4–0 to make it through to the quarter-finals for the first time, where they could only pick up one leg in their singles defeats to the Welsh pair of Gerwyn Price and Mark Webster.