Martins earned 30.43 percent of the week's vote for his finish in the Seattle Sounders' 2-0 triumph over Real Salt Lake, and that was enough to beat the 30.19 percent that Espindola received for his headed finish in the New York Red Bulls' 2-0 victory against Toronto FC.
Martins, who was also voted Week 29's MLS Player of the Week for his one-goal, one-assist performance vs. RSL, joins DeAndre Yedlin as Sounders players to win the Goal of the Week award in 2013.
The Nigerian forward found the back of the net on a well-worked passing sequence he was heavily involved in during the third minute of the match, firing a one-timed shot before launching himself into his trademark backflip celebration.
Final Votes - Week 29 (online poll and text vote):
1. Obafemi Martins (SEA): 30.43%
2. Fabian Espindola (NY): 30.19%
3. Kelyn Rowe (NE): 28.52%
4. Dominic Oduro (CLB): 5.69%
5. Robbie Keane (LA): 5.17%