Arsenal almost knocked the legendary 2011 Barcelona team, already remembered by many as one of the greatest sides of all time, out of the Champions League.
The Gunners were in the ascendancy in the tie until Robin van Persie was harshly sent off in the second leg with Arsene Wenger's men 3-2 up on aggregate at the time. Barcelona subsequently made the man advantage count to win the tie.
Arsenal had won the first leg at the Emirates Stadium, though, when late goals from Van Persie and Andrei Arshavin cancelled out an earlier strike from David Villa.
Wenger's overall record against Guardiola's Barcelona was not massively impressive - W1, D1, L2 - but when Arsenal beat Guardiola's Manchester City at Wembley on Sunday, the veteran French coach became the first to get the better of Pep at all three clubs the Catalan hero has managed.
The Gunners booked their place in the FA Cup final at City's expense after an extra-time winner from Alexis Sanchez edged Arsenal ahead in a 2-1 semi-final thriller.
And not only did Wenger ensure Guardiola would go trophy-less in his first season in England and keep his own chances of silverware alive in a difficult season that has been characterised by #WengerOut abuse by sections of the Arsenal fanbase, but he became the only manager to have beaten Barcelona, Bayern Munich and Manchester City teams led by Guardiola.
Wenger's win over Guardiola's Bayern came in last season's Champions League group stage, when Olivier Giroud and Mesut Ozil scored late at the Emirates to hand the Gunners a 2-0 win.
Bayern may have returned the favour with a thumping 5-1 win in the reverse fixture only a few weeks later, but what Guardiola is clearly not is a manager who has some kind of unbeatable hold over Wenger like Jose Mourinho did for so many years.
Wenger can beat Guardiola and he's done it in a way that no one else has so far matched.
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