(Adds sources on more fines annulled, competition authority comment)
ROME, Dec 23 (Reuters) - An Italian court has ruled in favour of Mediaset in a case involving TV soccer rights, scrapping a fine of 51.4 million euros ($54 million) imposed on the broadcaster earlier this year, a court document showed on Friday.
In April Italy's competition watchdog fined Mediaset and Sky Italia, a unit of Sky Plc, for violating competition laws in the 2014 sale of football rights for 2015-2018.
Sources close to the matter said the court had also annulled fines of 4 million euros imposed on Sky Italia and 9 million euros on soccer rights firm Infront.
Italy's competition watchdog plans to appeal the decision on Friday by the Lazio region's administrative court, a spokesman for the antitrust authority said.
$1 = 0.9577 euros Reporting by Alberto Sisto and Elvira Pollina,