The ATP's big four aren't dead yet.

Serena Williams, Lleyton Hewitt, Martina Navratilova, Patrick Rafter, Samantha Stosur and Nick Kyrgios are among the players showing emotional support while filming a Cure for MND commercial.

Agnieszka Radwanska rides a 14-match Fed Cup winning streak, while Maria Sharapova is poised for her first Fed Cup appearance in three years when Poland plays Russia for the first time.

Allegations of match fixing in the Dallas Challenger were made on Monday, after strange betting activity spiked during the match.

The Australian Fed Cup team hit the snow in Stuttgart for practice, while the British team enjoyed pre-practice football.

Protesters caused a commotion during the second set of the Australian Open.

A minor thumb injury temporarily curtailed Novak Djokovic during in the first set of the Australian Open final, but he appears to be alright.