start. At the 2008 Olympic Games in Beijing, she arrived as the world-record holder and favourite for the gold medal in the 400 m freestyle, having set the Olympic record in the heats (4:02.19), but only finished 5th in the final. On the same day, she recovered from that disappointment by setting a world record (1:55.45) in the heats of the 200 m freestyle; in the final, she broke her own world record (1:54.82) and won her first Olympic gold medal. Pellegrini also proved her strength in short course events at the 2008 European Short Course Championships in Rijeka when she won the gold medal in the 200 m freestyle at a world-record pace (1:51.85). At the 2009 Mediterranean Games in Pescara, Pellegrini broke the world record in the 400 m freestyle with a time of 4:00.41 to better Joanne Jackson's record of 4:00.66. 2009 World Championships At the 2009 World Championships in Rome, Pellegrini broke the world record again in the 400 m freestyle with a time of 3:59.15, winning the gold medal and in doing so becoming the first female swimmer to break the 4-minute barrier in the event; she won the gold medal also in the 200 m freestyle and she broke her own world record with a time of 1:52.98. At 2009 European Short Course Championships in Istanbul she broke the world record in the 200 m freestyle with a time of 1:51.17. At the 2010 European Championships in Budapest Pellegrini won the bronze medal in the 800 m freestyle, behind Lotte Friis and Ophélie-Cyrielle Étienne, and the gold medal in the 200 m freestyle with a time of 1:55.45; in the same year, she announced that she would be working with Laure Manadou's former coach, Philippe Lucas. 2011 World Championships At the 2011 World Championships in Shanghai, Pellegrini won the gold medal in the 400 m freestyle with a time of 4:01.97, becoming the second female swimmer after Laure Manaudou to win the gold medal in this event at two consecutive World Aquatics Championships. Two days later, she won the gold medal in the 200 m freestyle too with a time of 1:55:58, becoming the first female swimmer ever to win this title at two consecutive editions of the World Aquatics Championships; after the success in Shanghai, she parted ways with her French coach and began working with Federico Bonifacenti. 2012 In May 2012, she