BERLIN (AFP) - Britain's Jessica Ennis remained on course to win her country's first-ever world heptathlon title after five of the seven-discipline event here on Sunday. Ennis jumped a best of 6.29m in the long jump, the fifth event of the heptathlon, with just the javelin and 800m to come in the evening session. The result left the Englishwoman on 5,064 points, with home favourite Jennifer Oeser and Olympic champion Nataliya Dobrynska of Ukraine tied for second on 4,795. Poland's Kamila Chudzik produced the day's best jump of 6.55m to claim fourth spot overall, just two points adrift of Oeser and Dobrynska. Ennis, however, admitted that she was not satisfied with her long jump performance and hinted there would be no let-up in the two events to come. "I'm a bit disappointed with the distance to be honest," said the 23-year-old, who is seeking to succeed where compatriot and 2000 Olympic Games champion Denise Lewis failed - she managed two world silver medals. "I wanted to go further. I am not sure if I'll play it safe. I don't want to hold back." Ennis finished the first day in top spot on 4,124 points after recording field leads of 12.93sec in the 100m hurdles, 1.92m in the high jump and 23.25sec in the 200m. Ennis, who was fourth in the Osaka worlds in 2007 but who missed the Beijing Olympics after sustaining three stress fractures in her right ankle, also set a personal best of 14.14m in the shot put - her weakest even along with the javelin. An impressive season's best of 15.82m in the shot saw Dobrynska move from sixth spot to second on 2,932 points. But a disappointing 25.02sec in the 200m saw the Ukrainian net only 885 points compared to Ennis' 1,054 for the discipline. Dobrynska did, however, retain her second spot on 3,817 overnight, with Germany's Jennifer Oeser in third three points adrift and Ukraine's Lyudmyla Yosypenko in fourth at a further eight.