Roger Federer will mark his return to tennis after a lengthy injury-enforced absence against Dan Evans at the Qatar ExxonMobil Open in Doha.
British number one Evans, 30, sealed a hard-fought 6-4 1-6 6-2 win against Frenchman Jeremy Chardy in the first round.
Federer, 39, who has a bye through to the second round, is playing in his first tournament since last year's Australian Open after two knee operations.
The Swiss has been training with Evans in Dubai in preparation for his return to the tour and the latter will get the chance to use that inside knowledge when they meet in the second round.
Federer's compatriot Stan Wawrinka, the seventh seed, was beaten by South African qualifier Lloyd Harris, who came out on top after two hours and 40 minutes to win 7-6 (3) 6-7 (6) 7-5.
Harris now meets Hungary's Marton Fucsovics, who defeated Serbian Dusan Lajovic 7-6 (3) 6-3.
Belgian sixth seed David Goffin was a 6-4 6-4 winner against Serbia's Filip Krajinovic and will play American Taylor Fritz next.
Vasek Pospisil beat Australia's Chris O'Connell 6-3 6-4 to set up a clash with fellow Canadian Denis Shapovalov, and Tunisia's Malek Jaziri will play Georgia's Nikoloz Basilashvili after defeating Slovakia's Norbert Gombos 6-2 7-5.
