Nick Kyrgios must be reeling right now. Sara Errani is in Bogota this week hitting mostly underarm serves. The world No. 243—on the comeback trail from a doping suspension—made the quarterfinals of the WTA International as a lucky loser.

The only issue is that the nine-time WTA champion seems to have forgotten how to serve.

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The former world No. 5 been struggling heavily with her ball toss, needing three or four attempts before serving.

WATCH: Errani suffers serving yips in Bogota

She hit 18 double faults in each of her first three matches in Bogota, including her her first-round qualifying win over Danielle Lao, her qualifying loss to Jasmine Paolini and her first-round win over Irina Bara.

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WATCH: Errani suffers serving yips in Bogota

Against qualifier Bibiane Schoofs on Thursday, the 31-year-old made a change, and started serving underhand a lot more times than what she tried against Bara.

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Most interestingly, the 2012 French Open finalist reverted to the underhand strategy largely on her second serves. She hit just four double faults in her 6-2, 6-1 win over Schoofs, marking her first straight-set match in Bogota.

Her serving woes didn't just start in Bogota. Errani has been double faulting all season, with 22 struck in win over Irina-Camelia Begu in Guadalajara and 18 in a win over Heather Watson in Indian Wells.

The Italian served a 10-month suspension in two parts after testing positive for the banned drug letrozole, a substance her mother used for breast cancer treatment. She made her return in February this year, and ultimately lost to Astra Sharma in the quarterfinals on Friday, 6-1, 7-5.