This, after losing veteran goalkeeper Gianluigi Buffon to an early red card.
The Bianconeri, who are targeting a third straight Scudetto win, have streaked clear of Roma at the top of the table by winning 12 games in a row but a 13th straight victory would elude them in the capital city.
Buffon, 35, appeared out of sorts in the early exchanges and soon left his team at a real disadvantage when fouling Miroslav Klose to concede the penalty gratefully converted by Antonio Candreva.
For a long time Lazio seemed destined to claim their third win in four games but Fernando Llorente denied them, sparing Juve's blushes with a clever header that sent one of the points back to Turin.
In Saturday's other Serie A match, Raul Albiol's last-gasp goal rescued a 1-1 draw for wasteful Napoli and denied struggling Chievo their first league win of the new year.
The ambitious southerners have a particularly poor recent record against Chievo, who find themselves struggling to avoid relegation once again, and the bizarre trend looked set to continue when Gennaro Sardo scored early on.
An abysmal miss from Gonzalo Higuain set the tone for Napoli's frustrating evening, with Dries Mertens particularly profligate at the Stadio San Paolo, yet Spanish defender Albiol finally nicked a late goal to stop Chievo claiming a fifth win from eight recent encounters between the clubs.