In 2009 Borel gave up his physical therapy studies, which were too demanding for a high-performance athlete, and switched to physical education at INSEP, where he trained with the senior national team. He took part in the 2009 Summer Universiade, but did not earn any medal. Two quarter-finals finishes in the 2010–11 season had him selected into the senior national team for the first time. At the 2011 European Championships in Sheffield he reached the table of 16, defeating 2010 World silver medallist and teammate Gauthier Grumier along the way, but he yielded to Germany's Jörg Fiedler and finished 11th. In the team event France saw off Switzerland, Ukraine and finally Hungary to earn a gold medal.