Decent performance from Juve and some interesting stuff happening regarding the system.
Lazio's intention at the start of the game seemed to be to try and play something like a 4-2-3-1 with Hernanes putting pressure on Pirlo, and to have Mauri and Candreva asking questions of Juve in the space between the wing-backs and centre-backs.
However, with Juve playing the extra man in midfield, Lazio quickly had to ditch those ideas: Hernanes had to drop deeper to support Onazi and Ledesma against Juve's three more advanced midfielders, which left Pirlo without a direct opponent for most of the first half; Peluso stepped forward to mark Mauri, which left Asamoah free to push up the left side and not be burdened with defensive reponsibilities; and, with Lichtsteiner powering up the right and causing a problem, Lazio had to pull Candreva deeper to deal with him as Stankevicius couldn't do it alone.
So there went Lazio's attacking threat.
However, even with those adjustments, Lazio still couldn't stop Juve from opening them up pretty regularly. If their defence went narrow to try and prevent Juve's midfield runners bursting through, there was heaps of space for Juve's wing-backs. If Lazio made an effort to close down the space in wide areas, Juve were able to pick passes through the centre.
The extra man in midfield meant that Juve were still able to get some of the classic advantages associated with 3-5-2 (great presence through the middle) and that forced Lazio into surrendering the advantage that they should have had on the flanks.
Second half was a bit of a non event. Petkovic made good changes at half time (change to 3-4-1-2, with Ederson on Pirlo and generally getting Lazio on the front foot and trying to squeeze the game more) and the intensity completely disappeared from Juve's game as they were quite happy they had the lead and that Lazio couldn't hurt them.
Now, I wouldn't go overboard about the 3-5-1-1 system, as Lazio were missing half of their first choice team, but the extra man in midfield was interesting and would appear to be worthy of further consideration as an option against 4-2-3-1/4-3-3 opponents.
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Out of curiosity, why was Hernanes taken off during HT?
Petkovic, when he plays a two-man central midfield, generally prefers to play Ledesma or Hernanes with a more mobile player (Onazi, in this case).
Not entirely sure of why Hernanes was the one subbed rather than Ledesma, though I think Hernanes is one of the few Lazio players who has really been playing continually though all their Serie A and EL game recently, so it may just have been that Ledesma was fresher.