A group of technology entrepreneurs is staging a competitive event in San Francisco in which semen samples from 128 men representing different countries will be raced along a microscopic track, with a $100,000 prize going to the man whose fastest sperm cell crosses the finish line first.
The event is called the 2026 Sperm Racing World Cup. It is being promoted by its organizers as a “science-based competitive sport” designed to draw public attention to the fact that global sperm counts have dropped and to highlight declining male fertility rates. It is not a peer-reviewed scientific study, and it will not generate publishable research data in any conventional sense.
Why the organizers say this is worth doing
The project was created by tech entrepreneurs Eric Zhu, Garrett Niconienko, Nick Small, and Shane Fan. Their stated motivation is public health awareness rather than original research. “It’s about making male fertility something people actually want to talk about, track and improve,” Zhu writes on the event’s website. “We’re taking a topic no one wants to touch and making it interesting, measurable, and weirdly changing this paradigm.”
The underlying concern they are pointing to is real and documented in published literature. Between 1973 and 2018, global sperm concentration dropped more than 50%, from 101 million to 49 million sperm per milliliter. Several factors are implicated in this decline, including obesity, sedentary lifestyles, smoking, and exposure to certain chemicals and pesticides. These figures come from existing meta-analyses of sperm quality data; the Sperm Racing event does not itself add to or test that body of research.
What was already known before this event
Sperm motility how well and how fast sperm cells swim is an established clinical measure used in fertility assessments. Microfluidic technology, which involves fluid movement through channels at microscopic scale, has been used in reproductive biology research for years, including in studies examining how sperm navigate the female reproductive tract. The Sperm Racing organizers are applying this technology in a competitive public format rather than a laboratory research one.
How the event works
The competition will feature 128 semen samples, each representing a different country, racing along a microscopic track in San Francisco at a yet-to-be-disclosed location.
Entrants are sent a kit with which to provide a semen sample, which is mailed back to California and processed “through advanced lab techniques such as incubation, sperm washing, pipetting, and through a centrifuge,” according to Zhu. The stated purpose of this processing is to “isolate and prepare the most viable cells for racing.”
Under a microscope, the prepared cells are introduced into a custom microfluidic race track. The race course covers a straight distance of 400 microns roughly 0.02 inches, approximately the size of a grain of salt. A controlled microcurrent flows through the channel to create resistance. Times can range from several seconds to over 40 minutes, depending on whether cells become stuck on obstacles.
A custom computer vision system tracks every cell in every frame, including overtakes, and converts the raw microscope data into a 3D render for the viewing audience. The full event will be streamed online with high-resolution cameras, live leaderboards, and biometric data displays.
The competition uses a bracket format. Participants are grouped based on motility before entering a knockout-style bracket. The winner is the sperm cell that crosses the finish line first, and its donor receives the cash prize.
The event has drawn more than 10,000 applicants from around the world, including hopefuls from the US, Iran, Israel, and North Korea.
The event is being promoted as the world’s first sperm racing competition. That claim is complicated by the fact that a smaller version of the event was already held in Los Angeles in April 2025, where two students competed for a $10,000 prize in front of hundreds of spectators. The winner completed the course in 1 minute and 3 seconds. The organizers appear to be framing the 2026 San Francisco event as the first of international scale.
What this event does not do
The Sperm Racing World Cup will not produce peer-reviewed data, a study population with controls, or findings that can be compared statistically across individuals. Sperm motility, while measurable, varies with sample handling, temperature, time since collection, and processing method variables that a competitive event is not designed to control for. The event’s organizers have not claimed otherwise. Their stated goal is awareness, not research output.
The World Health Organization defines a normal sperm count as ranging from 15 million to 200 million sperm per milliliter; a rate below 15 million is considered low and can significantly impact fertility. Whether a competition format advances understanding of where individual men fall on that spectrum or encourages them to seek clinical assessment remains to be seen.
Full event details: 2026 Sperm Racing World Cup, organized by Eric Zhu, Garrett Niconienko, Nick Small, and Shane Fan. San Francisco, 2026. Livestreamed via spermracing.com.
