Michael Ciani's header went just wide for Lazio, before Bianconeri goalkeeper Marco Storari almost made a howler from an easy catch.
Lazio grew in confidence as the first half progressed and could have broken the deadlock on 35 minutes had Andrea Barzagli not been able to prevent Mauri from tapping in a loose ball from just yards out.
However, Juventus started the second half the better of the two sides as Alessandro Matri forced Marchetti into a good save in the opening minutes.
Peluso eventually broke the deadlock for the Bianconeri on 63 minutes when he headed in Emanuele Giaccherini's cross from close range.
It almost became 2-0 to the home side just minutes later when Arturo Vidal's shot from close range came off the post.
Lazio eventually scored the equaliser with five minutes of normal time left on the clock, Mauri placing a loose ball inside the Juventus goal from close range.