5 reasons to run a man to man defense in lacrosse:  

1- Emphasizes the individual athleticism of the individual lacrosse player.

2- Motivates lacrosse players to lock down their opponent and allows for switching or double-teaming to get the best match-ups.

3- You can also put your best defender on the offense’s best scorer.

4- Everyone is accounted for on the lacrosse field as every defender is assigned an offensive player.

5- Increasing pressure is easier when you need to get after the ball.