CRITICAL SUCCESS FACTOR. “Although sperm motility also requires ATP generated from glycolysis, a sperm’s success at fertilizing the oocyte is profoundly affected by mitochondrial dysfunction. In fact, mitochondrial dysfunction and mtDNA mutations, even those that have no discernible consequences in females, are strongly associated with male infertility.”
http://www.sciencedirect.com/science/article/pii/S193459091500209X