On March 15, 2014, Chanajon defeated Eakchanachai at Omnoi Stadium to win the 24th Isuzu Cup Tournament.
Facing Saiyok Pumpanmuang in the 2014 Isuzu Cup Superfight, he went on to lose by second-round knockout via elbow.
On September 20, 2014, Chanajon lost by first-round KO to Naimjon Tuhtaboyev via spinning back elbow at THAI FIGHT World Battle 2014: Vietnam.
In their rematch, Chanajon ended up winning by second-round knockout after landing a high kick, claiming the 2017 THAI FIGHT 72.5 kg title.
[6] On February 9, 2020 Chanajon challenged Jimmy Vienot for his WMC World -160 lbs title at the Empire Fight event in France.