World tennis No. 1 Naomi Osaka has split from her coach Sascha Bajin just 17 days after completing back-to-back Grand Slam victories at the Australian Open. "Hey everyone, I will no longer be working together with Sascha. I thank him for his work and wish him all the best in the future," the Japanese, 21, tweeted in a shock announcement.

Bajin, a former hitting partner to Serena Williams, responded: "Thank you Naomi. I wish you nothing but the best as well. What a ride that was. Thank you for letting me be part of this."