Playing in their first World Cup match since 1998, Steve Clarke's side secured a crucial three points in Foxborough, Massachusetts, and moved to the top of Group C following the earlier draw between Brazil and Morocco.
The breakthrough arrived in the 28th minute when McGinn reacted quickest inside the penalty area and saw his effort take a deflection before finding the back of the net. The goal proved enough to separate the two sides in a fiercely contested encounter.
Scotland started brightly and nearly opened the scoring earlier in the match. Midfielder Scott McTominay came close when his powerful effort struck the woodwork, while Ben Gannon-Doak caused problems for the Haitian defense with his direct running and creativity.
Despite falling behind, Haiti refused to back down and produced an energetic performance that kept Scotland under pressure for long periods. The Caribbean nation created several promising opportunities in the second half and came close to grabbing an equalizer as Scotland's defense was forced into a series of important interventions.
A late header from Frantzdy Pierrot drifted narrowly wide, while other dangerous attacks tested the Scottish backline as Haiti pushed for a dramatic finish. However, Scotland held firm to preserve their slim advantage and claim a memorable victory.
The win is Scotland's first at a World Cup finals since 1990 and provides a perfect start to their campaign. While the result will delight the Tartan Army, the performance also highlighted areas that will need improvement ahead of tougher Group C clashes against Brazil and Morocco.
For Haiti, the defeat was disappointing, but their spirited display demonstrated that they are capable of competing on football's biggest stage. Their resilience and attacking intent will offer encouragement as they prepare for their next group fixture.
As the tournament continues, Scotland will take confidence from securing three vital points, while Haiti will look to build on an encouraging performance despite leaving empty-handed.