2008–2011: Youth career In 2009, at the age of 17, Mayer won the
octathlon gold medal at the
World Youth Championships. In the following year, he won the
decathlon gold medal at the
2010 World Junior Championships. In 2011, at the
European Athletics Junior Championships held in
Tallinn, Mayer won the decathlon gold.
2012: First Olympic Games Mayer competed at the
2012 Summer Olympics, finishing 15th.
2013–2015: European Championships medals He won a silver medal in the
heptathlon at the
2013 European Athletics Indoor Championships with a new personal best of 6297 points. At the
2013 European Cup Combined Events he topped the podium and set personal bests in the
100 metres (11.04 sec),
long jump (7.63 m),
shot put (14.95 m) and the
discus throw (44.89 m). In 2014, at the
European Athletics Championships held in Zurich, Mayer achieved a personal best of 8521 points in decathlon, winning him the silver medal.
2016: Olympic silver medal On 6 March 2016, Mayer announced his withdrawal from the
2016 World Indoor Championships because of a heel injury sustained during the
hurdles race at the French Indoor Athletics Championships held at the end of February in
Aubière. At the
2016 Rio Olympics, Mayer earned a silver medal with a new personal best of 8834 points, finishing behind only two-time gold medallist
Ashton Eaton, who was the world record holder at the time. Highlights of his campaign include equalling or improving personal outdoor bests in four events (100 m, shot put, 400 m, pole vault) and performing seasonal bests in three others (long jump, high jump, 1500 m); he was also the best decathlete in two disciplines (the shot put, with 15.76 m and 836 points; and the pole vault, with 5.40 m and 1035 points, sharing first place with
Thomas van der Plaetsen) and led the standings at the end of the first day of the competition (i.e. after 5 out of 10 events). and showed a marked improvement in form for Mayer, bettering his former personal best of 8521 points (set during the aforementioned silver medal run at the
2014 European Athletics Championships) by 313 points and the French national record by 260 points.
2017: European Indoor Champion and World Champion Mayer's first combined events competition of the year was an indoor track and field triathlon (60m hurdles, shot put, long jump) at the National Indoor Meeting of Paris on 8 February. He finished last (out of three), with 1652 points after failing to receive a score in the 60m hurdles. At the
2017 European Athletics Indoor Championships in
Belgrade on 4–5 March, Mayer won the gold medal in the men's heptathlon. He set a new European record of 6479 points, beating the record set by
Roman Šebrle in
2004 in
Budapest by 41 points. It was also the second-best score in men's indoor heptathlon, behind
Ashton Eaton's world record of 6645 points. He achieved two new indoor personal bests (in 60m hurdles and pole vault) and established a new European record. On 15 April, he had his first outdoor competition at a triathlon (200m, high jump, discus throw) in
L'Étang-Salé,
Réunion. Mayer won all three events, finishing in first place with 2642 points. Mayer then took part in the decathlon in his adopted hometown of
Montpellier on 13–14 May, and achieved a season best mark in discus and shot put. He also took part in the French Elite Outdoor Championships in Marseille on 14–15 July, but struggled in the rainy and windy conditions and finished the competition with a few no marks. At the
2017 World Championships in Athletics in London, Mayer completed his first decathlon of the year and won his first World Championships gold medal with a world-leading score of 8768 points, ahead of Germans
Rico Freimuth (silver, 8564 points) and
Kai Kazmirek (bronze, 8488 points). This was also France's first international gold medal in the decathlon. Despite not coming first in any specific discipline, Mayer achieved new personal bests in the 100 metres (10.70s, 929 points), 400 metres (48.28s, 897 points), and the 110 metres hurdles (13.75, 1007 points). A setback in the pole vault – where he cleared his only mark at 5.10m only at the third and last try – 30 cm below his personal record – prevented him from breaking his personal record.
2018: Indoor heptathlon gold and world decathlon record In 2018, at the
World Indoor Championships held in Birmingham, Mayer won gold in the
heptathlon with 6348 points. In a closely fought contest, Mayer narrowly beat
Damian Warner of Canada by five points to win his first world indoor title. He achieved his indoor personal best in the 60m and long jump. However, at the
European Championships, he failed in the long jump with three fouls and did not finish the
decathlon. Mayer started strongly in the first day, but at 4563 points was still 140 points behind Eaton's first day total. In the second day, he achieved his best-ever distance of 71.90m in the javelin and the best-ever height of 5.45m in the pole vault in a competition, as well as wins in the 110m hurdles and discus, allowing him to break the world record by 81 points.
2019–2020 Mayer did not defend his European heptathlon title at the
2019 Indoor Championships. At the
2019 World Championships, Mayer suffered an injury and had to withdraw from the
men's decathlon event. He achieved his personal best in 100m and shot put and was leading the competition after 7 events, but withdrew before the pole vault due to a problem with his Achilles.
2021: Tokyo Olympics silver At the
2021 European Athletics Indoor Championships held in
Toruń, Poland, Mayer won the
Men's heptathlon event with 6392 points. At the
2020 Tokyo Olympics, Mayer started below expectation in the
Men's decathlon, ending in 5th place after the first five events. However, in the final day, he performed well in a few events, such as the hurdle and pole vault as well as a personal best in javelin throw, which allowed him rise in the ranking and win a silver behind
Damian Warner of Canada.
2022: Second World gold Mayer did not compete in the
2022 World Athletics Indoor Championships due to an issue with his
Achilles after catching Covid earlier. At the
World Championships held in
Eugene, Oregon in July, Mayer regained his world title in
Men's decathlon, during which Warner withdrew due to a hamstring injury. He again started poorly in 6th place after the first day, but gradually improved his position, and won in the last day with first place finishes in pole vault and javelin. He withdrew from the
decathlon at the
2022 European Athletics Championships after suffering a thigh injury in the first event.
2023: Third European indoor gold Kevin Mayer took part in the
2023 European Athletics Indoor Championships held in
Istanbul in March 2023. On the first day of competition, he equaled his personal best in the 60m (6.85s), achieved 7.41m in the long jump, reached 15.81m in the shot put and cleared 1.98m in the high jump, ranking second in the general classification, 67 pts from the Norwegian
Sander Skotheim. The second day, he won the 60-meter hurdles (7.76s), the pole vault (5.30 m) and managed to keep a lead of 30 points in the standings (6,348 pts against 6,318 pts) at the end of the 1,000 meters despite a slower time than his Norwegian opponent (2 min 37 s 82 against 2 min 44 s 20). He won a third European indoor heptathlon champion title after 2017 and 2021, equaling the performance of the Czech
Roman Šebrle on the number of titles of this event. Mayer went into the
2023 World Athletics Championships while suffering from pain in his left Achilles tendon. He eventually withdrew after the second event, the long jump, to focus on the
2024 Olympics to be held in Paris. A few days before the Olympic event was about to start in August 2024, Mayer withdrew
from the competition due to a thigh injury. The injury also kept him out of the entire 2025 season. ==Achievements==