Berlin, Aug 21 (DPA) Usain Bolt's hunger for world records continued at the world championships Thursday when he won the 200m title in a staggering 19.19 seconds.

The Jamaican star bettered the mark of 19.30 he set in the Olympic final in Beijing Aug 20, 2008, towering high above the rest of the field with the biggest winning margin ever over the distance.

Alonso Edwards of Panama trailed by .62 seconds in 19.81 seconds and Wallace Spearmon of the US was third like in 2007 in 19.85 seconds.

Bolt won the 100m world title Sunday in a stunning world record 9.58 seconds, shaving 11 hundredth of a second off his old mark, a feat he repeated Thursday.

Adding the Beijing races over 100m, 200m and 4x100m, Bolt has now won every major final he contested in world record time, an unique achievement.

Olympic champion Melanie Walker gave Jamaica further reason to cheer when she won the 400m hurdles just eight hundredth shy of the world record.

Walker ran away from her rivals on the home stretch and crossed the line in 52.42 seconds. Only Russian Yuliya Petchonkina was faster in her world record run of 53.34 seconds.

Former season leader Lashinda Demus of the US was second in 52.96 seconds and Josanne Lucas of Trinidad and Tobago took third in 53.20.

Local hope Ariane Friedrich faced Blanka Vlasic in an intriguing women's high jump final and the decathlon was due to be completed way behind schedule after a seemingly endless pole vault session.

Trey Hardee of the US led with 7,306 points after eight events from Ukraine's Oleksiy Kasyanov (7,124).