Dan Evans will be the first opponent of Roger Federer's comeback after victory over Jeremy Chardy at the Qatar Open.
Great Britain's Evans beat Chardy 6-4-1-6 6-2 in the first round in Doha and will face Federer in the last 16.
Federer, 39, has missed more than a year of action after undergoing two knee surgeries but has been practising with Evans in recent weeks.
"I got to practise the last two weeks - I thought he was playing pretty well, we played plenty of sets," said Evans.
"It was competitive, but it's all very different when you get on the match court,"
Evans, 30, is expected to face Federer on Wednesday evening.