The visitor to the Allianz Arena was the only Bundesliga team Lewandowski had never scored against prior to the match but he put that right in a one-sided rout.
In-form Bayern might well have been contesting the Champions League Final, which was scheduled for this Saturday before the coronavirus pandemic played havoc with the season, but its performances since the Bundesliga resumption a fortnight ago will give the Bavarian giant great confidence when Europe’s premier club competition does gets underway again.
Home teams had only won five of 27 matches since the Bundesliga restarted,heading into Saturday’s round of fixtures, but that statistic was never going to worry Hansi Flick’s team.
There was a touch of good fortune for the opener on 14 minutes as Mathias Jorgensen turned Benjamin Pavard’s mis-hit shot into his own net.
French defender Pavard did make it 2-0 just before the half hour mark as he met Joshua Kimmich’s corner with a trademark thumping header.
With Fortuna in retreat, a brilliant Bayern team goal saw the third on 43 minutes with Lewandowski getting in the act by converting after unselfish work by Thomas Muller.
The Polish star’s second came soon after the break as he flicked home a low cross from Serge Gnabry.
It was a 29th Bundesliga goal for Lewandowski and his 43rd in all competitions, equaling his best for the season with several matches still to play.
The rout was completed soon enough by flying Bayern defender Alphonso Davies, who picked up a loose ball and beat two men before scoring the fifth.
Muller missed a golden chance for a sixth, but it was of no significance as Bayern eased to victory and made its full complement of five substitutions to save legs for further challenges to come at home and in Europe, holding a 3-0 first leg lead over Chelsea in their Champions League last 16 tie when the season was halted in March.
Werder sinks struggling Schalke
Earlier, Werder Bremen gave itself further hope of survival with a 1-0 win at David Wagner’s Schalke to move within a point of Fortuna Dusseldorf, which is in the relegation playoff spot in 16th.
Former Huddersfield Town coach Wagner is under pressure after presiding over a desperate run of form at slumping Schalke, winless in 11 games and plummeting down the table since the restart.
Midfielder Leonardo Bittencourt scored the first-half winner for Bremen.
Hertha Berlin continued its fine form under new coach Bruno Labbadia with a 2-0 win at home to Augsburg, while Wolfsburg slipped to a 2-1 defeat at home to Eintracht Frankfurt.
Hoffenheim are seventh after their 1-0 win at Mainz, while on Friday Bayer Leverkusen improved to third with a 1-0 win at Freiburg.
Rising star Kai Havertz became the first player in Bundesliga history to score 35 goals before his 21st birthday with the winner for Leverkusen.