Rome prefect makes decision on public order and mobility grounds, and avoids clash with Italian Open final.Rome's prefect has ordered the capital's derby to be moved to Monday evening, contradicting an official announcement made the previous day by the Serie A chief executive - and prompting the league to threaten legal action. The Roma-Lazio derby has been rescheduled to Monday 18 May at 20.45, after the prefect of Rome overruled Serie A's own fixture announcement in a dispute that has exposed deep tensions between the football authorities and public order officials.  The decision was taken by Rome's prefecture on public order and urban mobility grounds, given that the men's final of the Italian Open tennis tournament - held at the Foro Italico, the same complex as the Stadio Olimpico - was already scheduled for Sunday afternoon. ClashThe clash of events had long been foreseeable, yet Serie A's scheduling had originally placed the derby on Sunday 17 May at 12.30 - an unusually early kick-off time specifically chosen to avoid overlap with the tennis.   Lazio manager Maurizio Sarri had publicly complained about the lunchtime slot, arguing that a hot day would be detrimental to both players and spectators.   The situation was further complicated on Monday when Serie A chief executive Luigi De Siervo officially confirmed the Sunday 12.30 slot, insisting that a Monday fixture was out of the question - in part because evening derbies in Rome had previously been banned following outbreaks of serious crowd violence.   Less than 24 hours later, Rome prefect Lamberto Giannini contradicted him entirely, announcing the match would take place on Monday at 20.45. Mattarella and SinnerGiannini explained that the decision followed an assessment by the provincial committee for public order and security, which concluded it was impossible to hold such a sensitive fixture at the same location as a world-class sporting event - particularly one at which President Sergio Mattarella is expected to be present, and where Jannik Sinner is likely to be competing. Knock-on effectThe rescheduling does not affect the derby alone. Serie A rules require clubs competing for the same objective - in this case, the top-four places that guarantee Champions League qualification - to play simultaneously.   As a result, Pisa-Napoli, Genoa-Milan, Juventus-Fiorentina and Como–Parma are also expected to be moved to Monday evening. Legal threatSerie A responded defiantly, with De Siervo indicating the league would seek judicial review of the prefect's order at the administrative tribunal (TAR).   The episode drew sharp criticism of the football authorities from politicians and police officials. Lazio regional president Francesco Rocca said he was delighted by the prefect's decision and called the league's original scheduling a superficial move, expressing hope that Serie A would plan its calendar more carefully in future. The national association of police officials also welcomed the ruling, stating that placing the interests of the wider public above those of a commercial sector was a strategic choice that must remain non-negotiable in matters of public safety.   Photo credit: Marco Iacobucci Epp / Shutterstock.com