Marcos will make his first appearance at the Diema Xtra Sofia Open this week. He opens against Kazakhstan's Mikhail Kukushkin on Tuesday.
Marcos opened his 2018 campaign at the Australian Open, defeating Yuki Bhambri, before falling in four sets to Andrey Rublev. He will look to rediscover his top form when he takes to the hard courts in Sofia. He will face Kukushkin for the second time, having prevailed in the 2014 final of the ATP Challenger Tour event in Aptos, USA.
Second seed Adrian Mannarino potentially awaits Marcos in the second round. Third seed Gilles Muller and fifth seed Robin Haase also loom in his half of the draw. Former World No. 3 Stan Wawrinka leads the field.
