Brussels had accused Google of giving more preference to its own services in the search results to the determinant of other price comparison sites, such as TripAdvisor and Expedia.
Google appealed on Monday against a record 2.4-billion-euro ($2.9 billion) European Union antitrust fine, with its chances of success boosted by Intel's partial victory last week against another European Union sanction.
Google said declined to comment further.
And while the two cases are clearly different - and the Intel verdict remains a partial one at this stage (the sanction has not been overturned as yet) - it's certainly unusual for Europe's courts to rule against Commission verdicts, offering some hope to Google's lawyers they can successful argue against the regulator's rationale.
If it did not, the Commission said, it faced penalty payments of up to 5 per cent of the average daily worldwide turnover of Alphabet, which is Google's parent company.
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Last week, the EU's highest court backed Intel Corp.'s appeal of a €1.06 billion antitrust fine from 2009, seen as dealing a blow to the antitrust regulator.
Google has already said it will comply with the changes to vertical search that Brussels requested, and has until September 27 to explain how it will put these into practice. A court spokeswoman said Google has not asked for an interim order to suspend the decision to levy an fine.
The EU flag is seen with Google logo.
The EU is also expected to soon decide another case against Google over abusing its dominance of internet search to impose its Android mobile operating system.