Yuvraj Singh, who played pivotal roles in India's victories in U-19 World Cup in 2000, T20 World Cup in 2007 and ICC World Cup in 2011, returns to cricket after a year. It doesn't really matter if he scores big or not, that he has defeated death and is back on the field is what truly matters now.
Sachin Tendulkar: There may be critics who wonder why the Little Master calling it a day, while many wonder how he maintains this longevity in his career. The fact is, he has endured every possible injury that a cricketer can sustain. But the worst of them was his tennis elbow. In 2004, tennis elbow had Sachin out of action for almost a year. Initially everyone was unsure of his return, including Sachin. It took him some time and he was back doing what he does the best - scoring runs.
Lance Armstrong: The American cyclist was diagnosed with Stage 3 testicular cancer in 1996, but he recovered to go on to win the sport's most prestigious race, the Tour de France, an unprecedented seven times. Yuvraj, during his treatment, read his autobiography for inspiration. Although Armstrong has been stripped off his Tour titles, Yuvraj continues to call him his real-life hero.
Kim Clijsters: A series of injuries forced this Belgian tennis star to announce her retirement. After the birth of her daughter, she announced her comeback in 2009. She won the US Open title, which was only her third tournament. She also won the Australian Open in 2011. She retired from tennis after her third-round loss to Laura Robson.
Eric Abidal: A tumour was detected on this France and Barcelona defender's liver in March 2011. He underwent surgery and two months later played the entire duration of Barcelona's masterclass in the Champions League final.
Alessandro Zanardi: He lived his life in the fast lane, quite literally. This former Formula One driver raced for Williams. He returned to CART in 2001 and at the EuroSpeedway Lausitz, he suffered a crash. He lost his both legs. But he returned to racing, but this time with a handcycle. He started competing in 2007. At the 2012 Paralympic Games on September 5, 2012, Zanardi won a gold medal in the men's road time trial H4 in London.
Kelly Holmes: It's no small achievement to win 1500m and 800m races at the age of 34. Kelly Holmes went to the Athens Olympics in 2004 after a forgettable season. She 1500m and 800m races to clinch gold medals. She later admitted to be suffering from clinical depression.
Niki Lauda: In 1976 at the German Grand Prix, Lauda's Ferrari deviated off the track, due to a rear suspension failure. It hit an embankment and rolled. The car burst into flames and he was trapped in the wreckage. Before he could be pulled out, he suffered severe burns to his head and inhaled hot toxic gases that damaged his lungs and blood. Although Lauda was conscious immediately after the accident, he lapsed into a coma later. He returned to the race circuit only six weeks later. He finished fourth at the Italian Grand Prix.
Felipe Massa: This Brazilian driver had a narrow escape from death. He had a considerably successful season in 2008. But he did not know what the new season had in store for him. At the Hungarian Grand Prix, Massa was struck on the helmet by a suspension spring that had fallen from Rubens Barrichello's Brawn, on a high-speed part of the track. As a result, Massa crashed head-on into a tyre barrier. He had to be airlifted. He underwent surgery. However, he returned to the F1 circuit in 2010.
Muhammad Ali: Muhammad Ali was stripped of his heavyweight world titles after he refused to fight in the Vietnam War. He was forced into retirement in 1964. But the fighter that he always was, Ali returned to the boxing ring six years later. He won back the World heavyweight title in 1974.