In November 2008, Akakariyama finished ninth at the Japan Open. In June 2009, he reached the semi-finals of the China Open. A month later, he made it to the final round of the
2009 WPA World Ten-ball Championship, in which he was defeated by the Taiwanese Chao Fong-Pang in the round of the last 64. In February 2010, he reached with the round of 16 at the
2010 French Open his best result on the
Euro Tour. In April 2010 he reached the round of 16 of the
2010 WPA World Eight-ball Championship, where he lost to
Ruslan Tschinachow. At the
2010 WPA World Nine-ball Championship, he would lose in the last 64 once again. At the
2011 WPA World Eight-ball Championship, Akakariyama retired in the round of 56. In May 2011, he reached the semifinals of the
2011 WPA World Ten-ball Championship, and would defeat eventual champion
Huidji Lake in the
double elimination round. At the
2011 WPA World Nine-ball Championship after wins against
Karlo Dalmatin,
Carlo Biado and
Mark Gray he would proceed to the final. There he defeated the Philippians
Ronato Alcano 13–11 and became 9-ball world champion. In February 2012, Akakariyama reached the knockout round of the 8-Ball World Cup and lost there against Roberto Gomez. At the
2012 WPA World Nine-ball Championship he lost defending the championship in the semifinals against
Thorsten Hohmann. At the
2013 World Games, he made it to the quarter-finals, where he was defeated by the Chinese
Liu Haitao 7–11. After being eliminated in the preliminary round at the 9-Ball World Championships in
2013 and
2014, he reached the main knockout again in
2015 and where he lost in the last 32 against
Ko Ping-chung. ==Titles==