Tamgho's good form continued into the 2010 outdoor season. He recorded a series of five jumps over 17 metres at the French National Interclub Championships, highlighted by a world leading jump of 17.63 m (and a new French national record), on 23 May in Franconville. He had a wind-assisted jump of 17.63 m two weeks later in Montreuil. On 12 June 2010, he took part in the Adidas Grand Prix in New York City, his first IAAF Diamond League event. In that event, he jumped 17.60 m in the third round, and improved by a centimetre in the next jump before setting a personal best of 17.84 m to take the lead. Having already secured victory, he pushed even further with his final attempt to jump 17.98 m, making himself the third best triple jumper outdoors on the all-time list behind Jonathan Edwards and Kenny Harrison. Just three days before his 21st birthday, Tamgho had achieved the longest triple jump outdoors for over a decade. He won the 2010 French National Outdoor Championships senior triple jump title for the second time, but had to contend with a right calf cramp en route to victory. He was ruled out of the Paris Diamond League meeting due to injury. He had not jumped in training in the buildup to the 2010 European Championships, but he still managed to clear 17.45 m to take the bronze medal, his first medal at the competition. Wins at the DN Galan and Memorial Van Damme triple jump events made him the inaugural 2010 IAAF Diamond League triple jump overall winner. He announced a change of coach at the end of the season, starting work with four-time long jump world champion Iván Pedroso. He was recognised as the 2010 European Athletics Rising Star of the Year for his breakthrough year.