By Graeme Bailey
Last Updated: 01/01/70 1:00am
The Amsterdam giants could have been crowned on Sunday, but rivals PSV Eindhoven won at FC Volendam - meaning a point in their next clash will be enough to seal the title.
Ajax are on the brink, following their tremendous win at The Oosterenk Stadion.
Czech stalwart Tomas Galasek grabbed a rare goal when he struck just before half time.
The real hero of the day was Belgian striker Wesley Sonck (pictured) who grabbed a second half hat-trick (56, 77 & 82) to put the match beyond doubt.
Wesley Sneijder had already added a fourth (79), just moments before Sonck completed his treble.
The defeat means Zwolle remain third from bottom and entrenched in relegation trouble as they lie three points off safety.PSV made sure Ajax will have to wait until next week after they equalled their rivals with a 5-0 away win at Voldendam.
Dutch international Andre Ooijer put them ahead after just 13 minutes, before John de Jong grabbed a quick-fire brace (51 & 58) early in the second half.
Serbian maestro Mateja Kezman completed the demolition job with a double (63 & 89). Third place Feyenoord will be desperately disappointed to have gone down 2-1 at FC Groningen at De Kuip.
Dirk Kuyt put the Rotterdam giants ahead just before the hour, but two goals in the last three minutes from Martin Drent gave lowly Groningen a shock success.
Rick Hoogendorp's goal after 58 minutes was enough for RKC Waalwijk to claim a 1-0 win over FC Utrecht The Mandemakers Stadion.
Relegation-threatened Vitesse Arnhem grabbed a late goal to secure a point in their home game with NEC Nijmegen.
Nick Hofs was the hero for Vitesse, as he netted both their goals, the second in the last minute, to cancel out a brace from Youssouf Hersi.