Dominic Thiem suffered another first-round exit at the Estoril Open on Tuesday, losing in straight sets to France's Benjamin Bonzi as he continues his comeback from a long injury lay-off.
The Austrian former world No 3 lost 6-3, 7-6 (11/9) to the 58th-ranked Bonzi on the clay in Portugal.
Thiem, the 2020 US Open champion, was beaten in the first round of the Serbia Open last week in his first tour-level match in 10 months.
The 28-year-old had been sidelined with a wrist injury suffered in a grass court tournament in Marbella in June last year. He has fallen to 93 in the rankings.