Svitolina, who is ranked seventh in the world, says she can't play upcoming Fed Cup matches in Poland because she is injured. But the federation says she and Dayana Yastremska originally agreed to play but withdrew after their agent made unreasonable financial demands
Stuttgart Open: Caroline Garcia stuns Maria Sharapova in first round; Karolina Pliskova beats Kiki Bertens
The 41st-ranked Sharapova returned to tennis in Stuttgart exactly a year ago after finishing a 15-month doping ban for meldonium and reached the semi-finals.
Fed Cup: Ashleigh Barty, Casey Dellacqua beat Nadiia and Lyudmyla Kichenok in doubles to help Australia pip Ukraine
Barty was Australia's leading light with her third victory of the weekend after beating both Lyudmyla Kichenok and Marta Kostyuk in her singles matches.
Australian Open 2018: From rising temperatures to 'miraculous' comebacks, a recap of Week 1 highlights
As the Australian Open heads into the second week, here's a look at some of the defining moments so far from Melbourne Park.
Australian Open 2018: Elina Svitolina downs 15-year-old Marta Kostyuk; Elise Mertens edges past Alize Cornet
Elina Svitolina has ended 15-year-old Marta Kostyuk's strong run at Melbourne Park, while Elise Mertens defeated Alize Cornet to enter the fourth round of the Australian Open.
Australian Open 2018: Rafael Nadal eases into 3rd round; Grigor Dimitrov, Caroline Wozniacki pull off thrilling wins
Nadal swept into the Australian Open 3rd round to keep his Grand Slam title hunt on track, as Caroline Wozniacki and Grigor Dimitrov pulled off great escapes to stay in contention.
Australian Open 2018: Elina Svitolina expresses injury concerns after 2nd round victory over Katerina Siniakova
Svitolina conceded only her second set in seven matches this year but ultimately found a way past her Czech opponent 4-6, 6-2, 6-1 as the temperatures soared on Rod Laver Arena
Australian Open 2018: Elina Svitolina sets up 3rd-round clash against 15-year-old Marta Kostyuk; Belinda Bencic ousted
Elina Svitolina came through a first set wobble to set up a third-round meeting with 15-year-old compatriot Marta Kostyuk with a 4-6, 6-2, 6-1 win over Katerina Siniakova.
Australian Open 2018: Meet Marta Kostyuk, the 15-year-old from Ukraine breaking records at Melbourne
Marta Kostyuk, a 15-year-old player from Ukraine, is creating history at the Australian Open. Here's all you need to know about her.