BUDAPEST, Hungary -- Julio Pablo Chacon scored a sixth-round technical knockout of Istvan "Koko" Kovacs to win the WBO featherweight title on Saturday.

Kovacs, of Hungary, became the WBO champion when he knocked out Antonio Diaz on January 27 in Munich, Germany.

Chacon, the No. 1 challenger, knocked the champion down at the end of the fifth round. Kovacs was saved by the bell.

Chacon, of Argentina, continued to pound Kovacs in the sixth round. The referee signaled the technical knockout 15 seconds into the sixth.

The 31-year-old Kovacs drops to 20-1. Chacon improved to 40-2.

In a WBO lightweight title fight, Artur Grigorian (33-0) defended his title for the 14th time, defeating Aldo Nazareno Rios by unanimous decision.

The bout was scored 117-110, 116-112 and 117-110.