From Andy Roddick to Martina Hingis: 5 Tennis stars who stunned the sporting world announcing early exit

Returning from retirement to a competitive sport is a test of mental and physical strength; it is also on part of the sportsperson a sign of positive intent and true passion.

At 36, comeback queen Kim Clijsters will find it difficult against Biancas and Osakas of women tennis

Kim Clijsters, 36, makes comeback in era dominated by teens

Williams will play her first Grand Slam after more than 15 months

Serena Williams time to find top form, says Clijsters

Clijsters on Saturday pulled a fan out of the crowd to play against her after he shouted advice to her during a friendly Wimbledon doubles match

WATCH: Irish fan made to wear Kim Clijsters' skirt after offering advice to players

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From Andy Roddick to Martina Hingis: 5 Tennis stars who stunned the sporting world announcing early exit

At 36, comeback queen Kim Clijsters will find it difficult against Biancas and Osakas of women tennis

Kim Clijsters, 36, makes comeback in era dominated by teens

Serena Williams time to find top form, says Clijsters

WATCH: Irish fan made to wear Kim Clijsters' skirt after offering advice to players