As of July 2018, who is the youngest winner of a tennis Grand Slam singles title since 1900?

In the Australian Open final in 1997, Martina Hingis won the title at the tender age of sixteen years and three months, to become the youngest winner of a Grand Slam singles event, since Lottie Dot in 1887 who won at Wimbledon aged just fifteen.

Martina Hingis was born in Switzerland and her parents called her Martina, after Martina Navratilova, hoping she would carve out as successful tennis career as her namesake had.

In her career, Hingis won five Grand Slam singles titles, thirteen Grand Slam doubles titles and seven Grand Slam mixed doubles titles. In 1997 she became world number one, a position she held for a staggering 209 weeks. Between 1997 and 2001 she was the highest paid female athlete in the world.

In 2002 however, she picked up a serious injury in her left hip and knee, forcing her to withdraw from competitive play. She returned in 2006 and fought her way back to World number six. However in 2007 she retired from the sport, due to further hip injuries,combined with a positive drug test for cocaine at Wimbledon.

In 2013 Hingis returned to the sport concentrating on doubles. She won several titles including ten Grand Slams during this time. Remarkably when she did finally retire in 2017 she was ranked number one in the world in doubles.