Giroud stunner gives Chelsea the advantage

Bayern has stuttered domestically with a draw and defeat in its past two Bundesliga matches, but it eased to victory at the Stadio Olimpico, scoring three of their four goals in the first half.

Jamal Musiala and Leroy Sane put the holder in complete control after prolific striker Lewandowski had opened the scoring with his 72nd goal in the competition, moving him behind only Cristiano Ronaldo (134) and Lionel Messi (119).

Francesco Acerbi's own goal early in the second half gave Lazio an even bigger mountain to climb and, while Joaquin Correa did pull one back with a fine solo goal, Hansi Flick's men are in complete control ahead of the return tie in Bavaria on March 17.

The host, competing in the knockout stages of the competition for the first time in 21 years, gifted Bayern the lead inside nine minutes as Lewandowski pounced on Mateo Musacchio's underhit backpass and rounded Pepe Reina for a simple finish.

Sergej Milinkovic-Savic was unfortunate not then to win a Lazio penalty and Bayern were soon instead two up through Musiala's drilled effort from the edge of the box following a smart team move.

Lewandowski was denied by Reina's leg, but the world champions added a third after some more lax play from Lazio, Patric losing the ball to Kingsley Coman, who fired in a shot that Reina could only parry to Sane.

Simone Inzaghi's side was further behind 62 seconds after half-time as Acerbi turned Sane's cross into his own net inside the six-yard box under pressure from Alphonso Davies.

But Lazio extended the Champions League record for both scoring and conceding in consecutive matches to 13 thanks to Correa's calm finish past Manuel Neuer after slaloming through the opposition defence.

Correa was denied a quickfire second by a good Neuer save and Ciro Immobile was also thwarted by the Bayern goalkeeper, although Lazio's deficit did not increase as Reina produced another good stop to keep out Lewandowski 10 minutes from time.