Khouma Babacar's last-gasp goal in a 2-1 Fiorentina win reminded new Palermo boss Eugenio Corini just how hard it will be to keep the Sicilians in Serie A.Roberto De Zerbi was sacked this week, with Corini promptly hired and tasked with ending a run of seven straight defeats and keeping Palermo afloat.It was an inauspicious start for the visitors to Florence as Federico Bernardeschi's 32nd-minute penalty put them under the cosh once more.Mato Jajalo provided hope with his stellar free-kick just four minutes after the break, but Babacar broke Rosanero hearts with a header at the end.ends