Siena climbed off the bottom of the Serie A standings with a stunning 3-0 defeat of Champions League hopefuls Lazio on Monday.
Switzerland striker Innocent Emeghara continued his bright start in Italy with a brace that came either side of Alessandro Rosina's goal for the hosts at Montepaschi Arena.
Emeghara, who joined Siena on loan from Ligue 1 outfit Lorient in January, put his side ahead after just six minutes, powering a header home from Matteo Rubin's pinpoint cross.
Rubin was again the provider of Siena's second on 23 minutes, delivering another perfect cross from the left with the onrushing Rosina clearing his marker and flicking the ball past Lazio goalkeeper Federico Marchetti.
Antonio Candreva's long-range effort was the best Lazio could muster in a first half devoid of any attacking impetus from the visitors.
Siena put the result beyond doubt just after the hour when substitute Francesco Valiani fed a pass through to Emeghara, who raced clear of Giuseppe Biava and slotted past Marchetti for his third goal in four matches for Giuseppe Iachini's side.
Lazio threw men forward late on as Hernanes saw his free-kick tipped over by Gianluca Pegolo while Ederson had a free header easily saved, but Siena saw out the deserved victory without any blemishes.
Iachini's men move to 18th place and within four points of safety.
Lazio, who could have closed the gap to second-placed Napoli to four points, are fourth, 11 points behind leaders Juventus and just outside the Champions League places.