Players delivered serious support for a cause during the Happy Slam.
Stars came together during the Australian Open to film a commercial in support of the Cure for Motor Neurone Disease Foundation.
Serena Williams, Lleyton Hewitt, Nick Kyrgios, Martina Navratilova, Samantha Stosur and Patrick Rafter were among the players who lent their emotional support to the cause in a moving commercial about the impact of the disease.
Also known as Amyotrophic Lateral Sclerosis (ALS) and Lou Gehrig's disease, the condition causes the degeneration of motor neurons leading to muscle weakness and atrophy.
"Motor Neurone Disease is a death sentence," the players say in the public service spot designed to raise awareness and funds for finding a cure. "First, you can't catch a ball. Then, you can't catch your breath."