Cristiano scored twice from the penalty spot, as Juventus opened up an eight-point lead at the top of the Serie A table, putting them on course for a ninth straight title following a 2-2 draw with Atalanta. 

Substitute Ruslan Malinovskiy fired in an 80th-minute goal that had Gian Piero Gasperini's in-form side on course to move into second place in the table courtesy of a 10th straight league win.

Duvan Zapata had put the visitors into the lead as they dominated in the first half, though they were pegged back soon after the break when a handball call against Marten de Roon allowed Ronaldo to level.

Having surrendered a two-goal lead to lose 4-2 at Milan in midweek, Maurizio Sarri's side appeared on course to suffer a second successive loss, in the process cutting their lead at the summit to six points.

However, referee Piero Giacomelli pointed to the spot for a second time when the ball struck Luis Muriel's arm in the 90th minute, allowing Ronaldo to deny Atalanta and leave Juve eight clear of Lazio.