Frank de Boer's Ajax sits atop the table on goal difference after a 2-0 victory at NEC Nijmegen.
In what was ideal preparation for their upcoming Europa League play-off against Czech side Jablonec, Arkadiusz Milik fired the Amsterdammers in front after 49 minutes before a Rens Van Eijden own goal made sure of the points three minutes from time.
Ajax is yet to concede in the Dutch top flight this campaign and that gives them the edge over Feyenoord, which was also a 2-0 winner at home to Vitesse.
The Rotterdam club left it late at De Kuip, with a Dirk Kuyt penalty eventually giving them a 78th-minute lead. Bilal Basacikoglu then found the target two minutes later to make sure of the points.
PEC Zwolle is also unbeaten this campaign and lies third after a 2-1 win over FC Twente.
Lars Veldwijk fired Zwolle in front from the penalty spot after 27 minutes but that lead was cancelled out by Hakim Ziyech at the start of the second half. However, Ben Rienstra's 64th-minute strike proved decisive as the home side enjoyed a second win in three matches.
ADO Den Haag needed a last-gasp goal from Mike Havenaar to secure a 1-1 draw at home to Utrecht, which led through Sebastien Haller's spot-kick on the half-hour mark.
AZ Alkmaar and WIllem II played out a goalless draw which leaves both clubs still searching for their first wins.
