The 25-year-old World Player of the Year picked up the ball in a central position in the 16th minute and left the Betis defence for dead before sending an angled shot across goal into the bottom right corner.
He has netted 73 goals for Barca and 12 for Argentina in 2012, matching Mueller's total for Bayern Munich and Germany in 1972. (Reporting by Iain Rogers, editing by Ed Osmond)
Ahead of the Champions League final between More »
Pitchside Europe - 5 hours agoMuch is made of Borussia Dortmund's attacking More »
Pitchside Europe - 6 hours agoEarly Doors believes Jose Mourinho left Real More »
Early Doors - 13 hours agoAlong with the inevitable search for a new coach, More »
Pitchside Europe - 20 hours agoCheck out our pick of Europe's best players this More »
Pitchside Europe - Mon, May 20, 2013 07:38 EDT