Michael Schumacher has announced his retirement from Formula One for the second time and will leave at the end of the current season, with his seat being taken by Lewis Hamilton. The 43-year-old decision won a phenomenal seven world titles in his first stint as an F1 driver, but since has comeback has finished on the podium just once - third place at the 2012 European Grand Prix - in three seasons.
Some sporting legends return and go from strength-to-strength, but others really shouldn't have bothered...
SHOULD HAVE STAYED IN BED
King Kev retired from football in 2005, having taken Man City back into the Premier League and kept them there, but couldn't resist the lure of resuming his Messianic status in 2008 at Newcastle. He was given a hero's welcome, befitting a man who took the club from the brink of the third tier in the early '90s to the brink of the Premier League title, but the club failed to win any of the first eight games under his charge second time rounf. Having guided the Toon to mid-table mediocrity, he left the following season after problems with owner Mike Ashley. We'd love it, love it, if he stayed retired this time.
The man who won five straight Wimbledon titles between 1976 and 1980 shocked the world of tennis when he retired at the age of just 26 in 1983, but his return to the sport in 1991 drew even bigger gasps. Clutching a then-utterly outdated wooden racket, it seemed like a wind up when he pitched up for his return at the Monte Carlo Open against one-time world number 23 Jordi Arrese. Whereas the cool Swede once dominated tennis, he was blown away by his opponent - or at least his modern graphite racquet. Borg didn't win a single set in his first nine comeback matches and lost all 12 of his ill-advised return.
The greatest basketball player the world has ever seen quit the sport in 1993 to try his hand at professional baseball, but when he struck out with the bat, Jordan returned to his first love in 1995 with tremendous success, winning a hat-trick of NBA titles to add to the three he'd won first time round. Jordan retired for a second time in 1999, but came back again aged 38 in 2001, this time in the unfamiliar colours of the Washington Wizards. There was to be no 'three-peat' on this comeback, however. In fact, Jordan and his new team came nowhere near the heights he'd achieved with the Bulls, as they failed to make the play-offs. The NBA legend later claimed he felt "used" when the Wizards' owner allegedly reneged on a deal to offer Jordan the role of team president when he eventually called it a day for good.
WELL WORTH THE EFFORT
The former world number one tennis player announced her retirement from the sport in 2007 so she could start a family, but on her comeback Clijsters emerged victorious at the 2009 US Open. In 2010 she repeated the trick, adding to her 2005 Flushing Meadows crown. In 2011, the Belgian won the Australian Open, dropping just one set along the way, but bid farewell to tennis for good in August after Britain's Laura Robson beat her in the second round of the US Open.
He may better known these days for his brilliant grills, but the younger generation need reminding that Foreman was one of the greatest ever heavyweight boxers and stunned the world in 1994 when he became a world champion at 45 after defeating Michael Moorer. The win came 20 years after his loss to Muhammad Ali in the 'Rumble in the Jungle' in Zaire and it was a long time coming for the big man, who had fought his way through a number of solid boxers to get the title shot with Moorer, following his return to the ring in 1987.
One of the most successful English flat racing jockeys of all-time, Piggott packed it all in in 1985 and two years later was sentenced to three years imprisonment for tax evasion. Perhaps needing a few quid, he returned to the sport in 1990 at the age of 54, winning the Breeders' Cup Mile and the winner at the 1992 2,000 Guineas.
A powerhouse of a man, Redgrave battled illness and expectations on his way to achieving an unprecedented five consecutive Olympic gold medals. After gold number four at Atlanta '96, he famously declared: "If anyone sees me anywhere near a boat, they have permission to shoot me." Thankfully for him, nobody took him up on the offer and he won his unprecedented fifth gold at a fifth Games at Sydney 2000.
After winning seven world titles between 1991 and 2006, should Michael Schumacher have come out of retirement?