Mackenzie Dern and Tammi Musumeci met 5 times on record, all of it packed into 2014 and 2015. Musumeci took the first two, both in 2014, beating Dern in the semi-finals of the 2014 World Jiu-Jitsu IBJJF Championship and again in the final of the 2014 Pan Jiu-Jitsu IBJJF Championship. Dern then swept all three of their 2015 meetings, which puts the head to head at 3 to 2 in her favor.

The way each fighter won tells you something. Musumeci's 2014 wins came by Choke and by advantage, so she showed she could finish Dern and also grind out a decision against her. Dern's answers in 2015 were more varied: a Gi Choke From Back at the 2015 Five Grappling Super League, a decision by other method at the World Championship, and a Toe Hold in the Pan final. That toe hold lines up with the rest of Dern's record, where the toe hold is her most frequent finish with 12 wins.

Both are high-percentage competitors overall, with Dern at a 70% win rate across 90 recorded matches and Musumeci at 69% across 26. The gap shows up in how they close: 59% of Dern's recorded wins come by submission against 33% for Musumeci. Their meetings crossed gi and nogi, and three of the five ended in a finish rather than points.