United Kingdom, Oct. 7 -- Google has lost its bid to delay a major antitrust ruling against its Play Store, after the US Supreme Court rejected the company's request to pause sweeping changes ordered in its legal battle with Epic Games.

The ruling means Google must proceed with reforms that could drastically reshape how app stores operate on Android devices.

The tech giant had asked the court to halt parts of a lower court decision that would force it to allow rival app stores access to its app library and stop blocking the download of competing platforms through Google Play.

It will also be required to permit developers to link users to cheaper, external payment methods for in-app purchases.

Google had argued that the mandated change...