Reigning Olympic champion Katie Taylor is out of the Rio Games.

The London 2012 gold medal winner was facing Mira Potkonen of Finland in her women's lightweight quarter-final, losing by split decision.

Taylor edged the first round with the Bray boxer up on two judges' cards and her opponent deemed to have won it by the third arbiter. 

Katie's got a lot of work to do here. Big round ahead #Boxing #TeamIreland pic.twitter.com/2vlcIXiDhY

— Team Ireland (@olympiccouncil) August 15, 2016

But the second round proved to be a setback as Potkonen edged that and the third.

And after the fourth round, with the result expected to be tight, the judges awarded Potkonen the victory by split decision.  

Katie has 90 seconds to turn this around #TeamIreland pic.twitter.com/opjF3RxNSf

— Team Ireland (@olympiccouncil) August 15, 2016

The margin of defeat was incredibly tight on the judges' cards over the four rounds of action: 

This is how close it was #OTBRio2016 pic.twitter.com/sFFqIFi97f

— Off The Ball (@offtheball) August 15, 2016

Judge B had called the fight level but in the end, deemed that Potkonen was the winner with Judge A having adjudged that Taylor should go through.