Siphelele Mthembu got the goal at a hot Seisa Ramabodu Stadium to hand Bloemfontein Celtic the three points.
The home side controlled matters in the middle of the park in the first half, and dominated possession.
But despite their supremacy Celtic were unable to break the deadlock due to some poor passing in the final third and some woeful long range shooting.
Santos took a very defensive approach to the game and were happy to sit back in defence and hit on the counter-attack.
Langeveldt’s first real test came in the 18th minute when he was at full stretch to save a Moses Spandeel header. The keeper was called into action a minute later when he did well to stop a 22-yard Hlompho Kekana shot.
In a rare foray forward Bonginkosi Macala came close to scoring for Santos when he found himself in space just inside the 18-yard area, but his volley went narrowly over the crossbar.
Four minutes later Langeveldt produced another good save, this time diving full stretch to his right to parry away a powerful 30-yard Dino Ndlovu shot.
Despite only mustering their second attack, Santos’ Musa Otieno probably had the miss of the half in the 42nd minute.
A well worked short corner saw the ball whipped into the box to find Otieno unmarked and in space only a couple of yards out from goal, but his header skewed off his head and missed the target by a mile.
Celtic continued to dominate in the second half and were unlucky in the 52nd minute when they struck the woodwork twice in the matter of a minute.
First, Spandeel broke down the left flank and drove into the 18-yard area before unleashing a powerful shot that beat the keeper, but struck the underside of the crossbar and bounced back into play.
Celtic then worked the ball back into the box to find an unmarked Prince Olomu, but he also saw his 12-yard effort strike the left-hand upright.
In the 74th minute Celtic’s pressure payed off when substitute Siphelele Mthembu scored his first goal of the season, powerfully driving home from just inside the 18-yard box.