World No. 3 lost to Marta Coastic in 73 minutes in the second round of the Qatar Open.
World number 21, Ukrainian, the WTA fought below 3-1 in the second set to win 6-2 7-5 in the WTA 1,000 event.
This is another defeat for the cure, who won goodbye in the first round and was playing for the first time when she lost to Pola Badwasa in the quarter -finals of the Australian Open last month.
The 2023 US Open Champion was eliminated by seven double errors and 39 unaccounted errors, while she continued to manage only eight winners.
Gauf won his last 17 matches against opponents outside the Top 20 before facing Coastic.
The 22 -year -old will now face the winner of the All Polish tie between Magda Lattet and Magdalena Frech.
Elsewhere, former Wimbledon champion Elena Ribakina won 6-2 6-4 against US Patten Starens, while Jasmine Paulini-Last year’s Wimbledon and the French Open Runner Up-6-3 to 6-3 to 6-3 6- 4 defeated.
Linda Noskova won 6-2 6-3 against Kazakhstan’s Yulia Potenshafa, which formed the last 16 meeting with defending champion IGA Sweet three times.
