The EirGrid All-Ireland U21 Championship semi-finals took place at O'Connor Park in Tullamore on Saturday.
In the first game of the day, Mayo played the Dubs.
The Connacht champions took a six-point lead in the half - 1-7 to 0-4 - mainly thanks to Diarmuid O'Connor.
Ten minutes into the game, O'Connor grabbed a goal for his side thanks to some quick thinking.
After a high ball broke down to Liam Irwin, the corner-forward spotted O'Connor in space. With Dublin keeper Lorcan Molloy advancing, O'Connor wasted no time in applying the finish.
Diarmuid O'Connor could be the greatest player in the GAA. The man is incredible.
— Cormac O'Malley (@cormacpro) April 16, 2016
Brilliant goal from Diarmuid O'Connor. Graham Geraghty-esque
— Brian Flanagan (@BHDFlanagan) April 16, 2016
Classy, classy finish from Diarmuid O'Connor
— Donnchadh Boyle (@depboyle) April 16, 2016
Here's the goal.