Arena Sapalinka number one in the world and the third number of Coco Goff in the second round of the Qatar Open Championship.
Sabalinka was beaten by Ekaterina Alexandrova at the WTA 1000 event in Doha, while Gauff lost to Marta Kostyuk.
The Russian Alexandrova, who beat Emma Radocano in the first round, came from a collapse twice in the third group and held her two times against the Grand Sam champion three times.
Then the number 26 kept her nerve in the third group of a tie to secure the 3-6 6-3 7-6 victory.
The 30 -year -old, who won the WTA tour in Austria last week, will play the role of Eliz Mertens in Belgium in the past 16.
The Ukrainian Kostyuk, the international number 21, resisted from 3-1 to the bottom in the second group to conclude 6-2 7-5 victory over Gauff in only 73 minutes.
It is a second consecutive defeat for Gauff, who won farewell in the first round and was playing for the first time since she lost to Paula Padosa in the quarter -finals of the Australian Open last month.
The 2023 US Open champion was retracted by seven dual mistakes and 39 non -imitated mistakes, while only eight winners were managed.
Jouf had won the last 17 games against opponents ranked outside the best 20 before confronting Kostyuk.
The 22 -year -old will now face the winner of the tie between Majda Lynette and Majdalina Frick.
Elsewhere, Elina Ribakina, a former Wimbledon champion, won his 6-2 6-4 victory over America Biton Sterins, while Yasmine Paulini-Wimbledon last year defeated Caroline Garcia 6-3 6-4.
Ons Gabor, who made a three-time angle at the Grand Slam, held a meeting with former Australian Open Champion Sofia Kenin after beating the world in the eighth place of Qinwen Zheng from China 6-4 6-2.
This was the first Tunisian victory against the 10 best opponents since Madrid's opening last year after he was struggling with injury.
Rebecca Saraamakova of Slovakia of a group of twelfth place to beat Mira Andreva 3-6 6-3 7-5, while Jessica Peugeot VI defeated Elena Svetolina 6-3, 7-6 (7-3).
Linda Nuskova won 6-2 6-3 against Yulia Puttziva from Kazakhstan to create another 16 meeting with the defense champion three times Iga Swiatek.
