ZWOLLE, April 17 (Eredivisie) - The great escape continues for Zwolle after Hennie Spijkerman's battling side followed up on last week's improbable win over AZ Alkmaar with victory over UEFA Cup-chasing Heerenveen.
Apparently dead and buried two months ago, Zwolle now have a real chance of escaping the drop with four games remaining,
There latest win at the Oosterenkstadion on Saturday night came after Bert Zurrman's strike on the stroke of half-time and sees them move four points ahead of rock-bottom Volendam.
Heereeveen started the brighter of the two sides with Stefan Selakovic connecting with Gerald Sibon in a slick attacking move but the former Sheffield Wednesday player headed wide.
The visitors continued their early pressure with a Mika Vayrynen attempt on goal after 26 minutes saved by home goalkeeper Johan van der Werff.
But Zwolle gradually came into it, and Andre De Ridder offloaded to Ivar Van Dinteren who shot wide.
The hosts were rewarded for their patience as Zuurman broke the deadlock in the closing moments of the first half after chasing down Dominggus Lim-Duan's ball and hitting a 20-yard shot to the left of the diving Van der Werff.
Heerenveen dominated proceedings after the interval but will have been distraught at their total inability to locate the back of the net.
A 59th-minute shot from Sibon rebounded out to Mika Vayrynen but his effort went wide.
Six minutes later a Mika Vayrynen header fell to Sibon but his shot hit the outside of the post.
The visitors continued to pile on the pressure and both Daniel Berg Hestad and Antonio Correia headed over the bar on 67 and 87 minutes respectively.
Zwolle dug in as Heerenveen again went close through Richard Knopper and Sibon late on.