Who won Thomas Petersen vs Valter Walker?

Valter Walker is a significantly more dangerous and well-rounded heavyweight than Thomas Petersen. Walker's record is pristine at 15-1 with four straight wins, three of them first-round submissions via heel hook—a devastating signature that has become nearly automatic. He holds massive physical advantages: 5 inches of reach (78.5 vs 74), 4 inches of height, and superior leg reach. His grappling metrics are elite: 5.74 takedowns per 15 minutes at 69% accuracy, 2.55 submission attempts per 15 minutes, and he has never been submitted. Petersen is a journeyman with inconsistent form—one win in his last five fights, losses to Shamil Gaziev and Vitor Petrino by early stoppage, and a tendency to be finished (3 KO/TKO losses). His striking output (3.1/min) is higher than Walker's (2.0/min), but Walker's takedown dominance and submission threat are far more pressing problems. Petersen's 43% takedown accuracy and lack of submission defense make him vulnerable to exactly what Walker does best.