Valon Behrami’s strike proved decisive for Udinese, although Genoa had more chances and the visitors were reduced to 10 men.
Both sides were revitalised by a change of management. Davide Ballardini steered the Grifone away from the drop zone, while Massimo Oddo saw his run of five wins and two draws ended on Wednesday by Lazio in their rescheduled Week 12 fixture. Giuseppe Rossi was still on the Grifone treatment table, but Udinese missed Ali Adnan and Silvan Widmer.
Udinese conquered Marassi only once since 1983, a 4-2 thriller in January 2011, along with four draws and 10 defeats here.
Gianluca Lapadula had a great chance in the opening three minutes, forcing Albano Bizzarri to parry with his outstretched legs.
Genoa had another excellent chance to score with Armando Izzo setting up Nicolas Spolli, his volley from a tight angle deflected off target.
The deadlock was eventually broken by Udinese with a goal out of nowhere. Maxi Lopez’s attempt was charged down and Behrami simply put his foot through it from outside the area, drilled low into the near bottom corner.
However, the Friulani then went down to 10 men, as the referee at first booked Samir for a tackle from behind on Goran Pandev, then after consulting VAR opted for a red. The defender was late and seemed to tread on the back of Pandev’s ankle.
Genoa were too hasty and allowed Udinese to defend well, but went so close to an equaliser when Andrij Galabinov’s header bounced off the bar from a corner.
It seemed impossible for Luca Rigoni not to score at the 88th minute when he came sliding on to an Adel Taarabt assist, but he somehow managed to accidentally clear it off the line rather than tap in.
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Sent off: Samir 64 (U)