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Lionel Messi netted the seventh Champions League hat-trick of his career, as Barcelona humbled ten-man Manchester City 4-0 at Camp Nou.
Messi opened the scoring on 17 minutes following a Fernandinho slip, but City arguably could have gone in at the break level had John Stones managed to get his 45th-minute header from a David Silva free-kick on target.
But the game changed on 53 minutes, when former Barca goalkeeper Claudio Bravo was sent off for a handball outside his area after he had gifted possession to Luis Suarez.
Messi made it 2-0 on 61 minutes from Andres Iniesta's pass following a Kevin de Bruyne error, then completed his fifth hat-trick of 2016 with a 69th minute tap in after Ilkay Gundogan's poor pass dropped into the path of Suarez.
Barcelona were also reduced to ten men in the final 15 minutes when substitute Jeremy Mathieu was shown a second yellow card for a foul on Raheem Sterling, but it did not stem the tide.
City substitute goalkeeper Willy Caballero saved a Neymar penalty on 86 minutes, awarded for Aleksandar Kolarov's trip on Messi, but the Brazilian made it 4-0 two minutes later following a jinking run and more feeble defending from Stones.
Barcelona top Group C with three wins from three, and meet second-placed City at the Etihad next on 1 November.
Borussia Dortmund lie third with three points from three matches following Wednesday night's 2-0 win over bottom club Celtic at Parkhead.
Lars Stindl netted the first after 57 minutes from Andre Hahn's pass following a Kolo Toure mistake, and the Ivorian was at fault for the German side's second goal on 77 minutes, with Hahn netting himself after taking advantage of Toure's poor pass.
Conor McGregor will fight Eddie Alvarez for the lightweight belt at UFC 205 in New York on November 12 live on the eir Sport pack. The eir Sport pack is free to all eir broadband customers. To learn more about setting sport free visit www.eir.ie/sport .