World number one Jannik Sinner may take time to hit his stride on his return from a three-month doping ban next month but will be in top form when he heads to the French Open, Italy's Davis Cup captain Filippo Volandri said.

Serena Williams has highlighted the perceived double standards surrounding men’s world No. 1 Jannik Sinner’s doping ban, saying in a new interview with Time magazine that she would have been suspended for 20 years for a similar offense.

Serena Williams believes she would have had Grand Slams taken away from her if she failed a drug test during her career.