Though seahorses are not known to mate for life, many species form pair bonds that last through at least the breeding season. Some species show a higher level of mate fidelity than others.   However, many species readily switch mates when the opportunity arises. H. abdominalis and H. breviceps have been shown to breed in groups, showing no continuous mate preference. Many more species' mating habits have not been studied, so it is unknown how many species are actually monogamous, or how long those bonds actually last. 
A month after the World Championships, Sun competed in China's 12th National Games , which are held every four years. At this competition, Sun was vying to become the first man to win seven gold medals at a single championship. To do this, he added the 100 metre freestyle to his repertoire, typically an event reserved for sprinters. With the games holding the same schedule as the Olympics, he first competed in the 400 metre freestyle, winning in 3:, over a second ahead of Hao Yun . The following day, he won the 4 × 100 metre freestyle relay event, swimming the anchor leg in seconds. He followed his performances the next day by setting a new Asian record in the 200 metre freestyle with a time of 1:, about half a second faster than his time in London. This time was a follow up to the 1: anchor leg he had swum on the 4 × 200 metre freestyle relay the 2013 World Championships. He showed his versatility the next day when he won bronze in the 100 metre freestyle, getting under 49 seconds for the first time with a time of seconds.