Gallagher has also scored three aces in medal play.
The medal play will come next week, and Cuba has won all four games so far.
But the Open isn't match play, it's medal play.
If a team lost in the pre-quarterfinals or quarterfinals, they were eliminated from any further advancement in medal play.
The three highest placements in each of the four pools would advance to medal play.
The 17-year-old McDonald won all six of his matches after the opening round of medal play.
Although Spain has been a power in water polo in recent Olympics, it never advanced to medal play.
We find that's fairer than medal play, since it gives less-talented players more chance to win.
This is a better-ball, two-man senior event at 72 holes of medal play.
Stroke play, also known as medal play, is a scoring system in the sport of golf.