Medvedev had to come from a set down against Lorenzo Sonego in the previous round, but said he may have been struggling with an illness.
Daniil Medvedev returned to action for the first time since his Australian final defeat on Tuesday with a straight sets win over Alexander Shevchenko in Dubai.
Medvedev feels ready to get back on court after spending the last seven days training in Dubai.
Czech teenager Jakub Mensik stunned top seed Andrey Rublev in straight sets at the Qatar Open on Thursday to reach his maiden ATP semi-final and guarantee a spot in the world's top 100 for the first time.
Andy Murray suffered another setback with a marathon loss to Czech teenager Jakub Mensik in the Qatar Open second round on Wednesday.
Gauff has been outspoken from a young age, and grew up with activism engrained in her DNA, passed on from her grandmother Yvonee Lee Odom, who desegregated her high school in Delray Beach in the early 1960s.
For any other player but Novak Djokovic, a below-par Australian Open at the age of 36 would have had pundits brushing up his tennis obituary. Djokovic, of course, is no ordinary player.
The Spanish star took a medical timeout, had the ankle taped and won the first game but after dropping his serve in the second game he called it quits, in another setback to a so-far disappointing 2024 campaign.
Former world number one Andy Murray ended a six-match losing run to topple qualifier Alexandre Muller 6-1, 7-6 (7/5) at the Qatar Open on Tuesday.
Australian Open champion Jannik Sinner powered to his first Rotterdam Open title on Sunday, breaking down a determined defensive effort from Australia's Alex De Minaur to win 7-5, 6-4 in a high-quality battle.