Former Education Minister Yunos Qanuni, who was expected to be Karzai's closest challenger, was running at 17 percent, ahead of ethnic Uzbek warlord Abdul Rashid Dostum with 13 percent.
The tally, however, is only a tiny fraction of the estimated 8 million votes. Counting began yesterday after five days of delays due to complaints of electoral irregularities.
Final results are due at the end of October.
[For more on the Afghan elections, see RFE/RL and Radio Free Afghanistan's dedicated "Afghanistan Votes 2004-05" webpage.]