Arsenal lost 3-1 to Bayern Munich in the Champions League final 16, three days after they were knocked out of the FA Cup.
The Gunners were 2-0 down after just 21 minutes into the first leg match, thanks to goals from Toni Kroos and Thomas Muller.
Lukas Podolski pulled one back for Arsenal with a header after the break.
But Bayern's Mario Mandzukic took the final score to 3-1 at the Emirates.
Walcott’s deployment as a central striker looked a sound tactical switch by Wenger as the England forward quickly got behind the Bayern defence, with Santi Cazorla also making good headway down the right.
However, the high-octane
atmosphere from the home support fell flat as Bayern grabbed a crucial away goal on seven minutes. Muller’s cross from the right was not dealt with and Kroos crashed the ball off the turf and past Wojciech Szczesny from 18 yards.
Bayern continued to spray the ball across midfield, this time Franck Ribery picking out captain Philip Lahm on the overlap down the right, his cross put behind. From the resulting corner, it was 2-0 and looked game over after just 21 minutes.
Ten minutes into the second half, a corner from Arsenal midfielder Jack Wilshere found former Bayern forward Lukas Podolski unmarked and he gratefully nodded past keeper Manuel Neuer.
It was the first goal conceded by Bayern this year and rattled the visitors as the home crowd sensed that maybe all was not lost amid memories of Arsenal’s 2-2 draw with Barcelona in 2010 when they also trailed 2-0.
Arsenal substitute Olivier Giroud nearly equalised with his first touch after joining the fray with 20 minutes left but his sweetly-struck shot from Walcott’s cross went straight at Neuer.
The revival was cut short after 77 minutes when Bayern counter-attacked in devastating fashion and Lahm’s skidding cross spun up and in off bayern’s Croatia striker Mandzukic.
Arsenal now have a lot of work to do in the second leg in Munich on 13 March.
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Porto 1-0 Malaga
Porto took the upper hand in their Champions League last 16 tie with Malaga as they emerged victorious with a routine 1-0 win at the Dragao.
In what was a largely stale first half, Manuel Pellegrini's selection of two immobile strikers in Julio Baptista and Roque Santa Cruz saw his side pose very little threat as the hosts dominated possession. However, it was not until the second half that Vitor Pereira's men made their superiority on the night count as Joao Moutinho slotted home a tidy finish to win it.
Porto dominated in every phase of the game against a timid Malaga side.
Led by Portuguese international Moutinho and Brazil’s Fernando Reges, the home team kept the visitors bottled up in their own end for minutes at a time.
Even after Porto scored, Malaga continued to sputter on offense, failing to establish the control of the ball that has been their trademark.
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