Kim Clijsters' first WTA Tour match in eight years ended in defeat to Garbiñe Muguruza at the Dubai Duty Free Championships.
She was beaten 6-2, 7-6 (6) in an hour and 37 minutes.
Meanwhile, Tunisian Ons Jabeur is into the last 16 after beating American Alison Riske, 7-6, 1-6, 6-3. She’ll now play world number 2 Simona Halep.
Czech Barbora Strycova has graduated into the last 16 after beating Amanda Anisimova 7-6, 2-6, 6-4.


Arsenal must improve defensively despite win over Wolves, says Arteta
Dubai Capitals secures thrilling nine-run victory over Abu Dhabi Knight Riders
Dominant pitching leads Mid East to series saving win over Mumbai
Police detain organiser of Messi visit after Indian fans rip up seats
Patel dominates as Mumbai take Game 1 of United Series
