By FOX Sports staff
Heading into the game having won ten of their 12 games in the 2013 season so far, the Stags were heavily fancied to pick up all three points and restore their five-point lead at the top of the table.
However, they were dealt a in the 36th minute when goalkeeper Sasa Dreven had to be replaced after picking up a head injury and just three minutes later, his replacement Ridhuan Barudin dropped a freekick at the feet of Qiu Li, allowing the Singapore international to fire Balestier into the lead.
A minute before the break, it was 2-0 when Kim Min-ho acrobatically fired home on the rebound after his initial shot had come back off the post, before Tigers captain Paul Cunningham all but killed the contest by adding a third in the 47th minute.
Five minutes before the hour mark, South Korean midfielder Park Kang-jin got in on the act to round off the scoring and hand his side an astounding victory, which was also only Tampines' second loss of the league campaign.
Over at the Sultan Hassanal Bolkiah National Stadium, bottom side Courts Young Lions finally got their first point of the season after they held DPMM FC to a 1-1 draw.
The Bruneian outfit went ahead after just nine minutes when Adi Said opened the scoring, but Fareez Farhan struck three minutes before halftime to earn a share of the spoils for Aide Iskandar's young charges.
Finally, Warriors FC's miserable run continued as they were held to a 1-1 draw at home to Woodlands Wellington, although it could have been much worse had it not been for Tatsuro Inui's late equaliser.
Following a goalless first half at the Choa Chu Kang Stadium, it was the visitors who took the lead in the 62nd minute Atsushi Shimono was left with too much time and space on the edge of the area, and proceeded to send a rocket of a strike into the top corner.
But with two minutes remaining, Inui stepped up and curled home a freekick beyond Yazid Yasin's despairing dive to earn his side a share of the spoils, although the result the Warriors languishing at the wrong end of the table.
Saturday's Great Eastern-YEO's S.League Results
Balestier Khalsa 4-0 Tampines Rovers
Warriors FC 1-1 Woodlands Wellington
DPMM FC 1-1 Courts Young Lions
Image courtesy of Balestier Khalsa FC (Andrew Lim)