Winning a Golden Slam – all four Grand Slams and an Olympic gold medal in the same year – is one of the greatest achievements in tennis with Steffi Graf the only player – man or woman – to achieve it.

John Travolta, just like Olivia Newton-John, skyrocketed to fame following the release of the film musical Grease in 1978, the year after he danced his way across the big screen in Saturday Night ...