Background: In vivo, the zona pellucida (ZP) of the oocyte can bind to normally functional sperm. The ZP-sperm interaction is one of the final steps of natural selection during their journey in the female reproductive tract. Aim: In the current study, we evaluated the ability of the ZP of immature oocytes to harvest the fittest sperm. Method: We compared the embryological outcomes (i.e., rates of fertilization, cleavage, blastocyst formation, and highquality blastocysts) of intracytoplasmic sperm injection (ICSI) using conventionally selected sperm (control group) and ZP-bound sperm (treated group). Results: Our results showed that there were no statistically significant differences for the ZP binding technique over the conventional sperm selection with respect to the rates of fertilization and cleavage. However; the rates of blastocyst formation and high-quality blastocysts were significantly higher in the treated group compared to the control group. Conclusion: These findings imply that the proposed technique (ZP-bound sperm) can serve as a cost-effective and natural sperm selection method that has the potential to improve the embryological and clinical outcomes of intracytoplasmic sperm injection (ICSI).