 He would fight exclusively in Finland for the next six years, remaining undefeated until 20 April 2013, when Łukasz Maciec stopped him in five rounds.On 7 February 2015, Koivula fought away from home for the first time in an attempt to win the vacant IBF Inter-Continental junior-middleweight title, but lost a unanimous decision to Marcello Matano in Italy.Another visit to Italy, on 22 April 2016, saw Koivula challenge unsuccessfully for the vacant European welterweight title, being stopped in nine rounds by Leonard Bundu.