The Supreme Court declined to block Microsoft's $68.7 billion purchase of Call of Duty developer Activision-Blizzard, all but opening the path for the merger to go through.

Justice Elena Kagan declined to put a temporary injunction on the merger after a group of gamers filed an emergency application to stop the deal. The decision comes after a California court ruled in favor of Microsoft in a lawsuit filed by the Federal Trade Commission. Tuesday is also the final deadline for the merger, which will go into effect by midnight.

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"The merger between Microsoft and Activision would be one of, if not the largest technology mergers in history, at a time when concentration among technology companies is already threatening the competitive balance of our economy and even our political systems," the group argued in their application.

Judge Jacqueline Scott Corley in San Francisco issued a decision in favor of the Xbox developer's merger on June 11 after a five-day proceeding in which several high-ranking executives from the FTC, Microsoft, Sony, and Activision-Blizzard commented on the deal.

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The decision has also been under review by several other countries. The European Union ruled in favor of the merger, while the United Kingdom initially blocked it. A London tribunal formally paused Microsoft's appeal on Monday to give Microsoft and the U.K.-based Competition and Markets Authority two months to resolve the dispute. The CMA announced less than an hour after the initial ruling by Corley that it would consider a modified proposal from Microsoft.