Top seed Dominic Thiem was dumped out of the Sofia Open while home favourite Grigor Dimitrov made a winning start in the Bulgarian capital.
Austria's Thiem, the world No.8, fell 6-4 6-4 to Georgian player Nikoloz Basilashvili in the second round while third seed Dimitrov came from behind to beat Jerzy Janowicz 4-6 6-3 7-5.
Dimitrov's victory marked a successful homecoming following his run to the semi-finals of the Australian Open last month and he was quick to acknowledge the support he received.
"The crowd won the match today," the world No. 13 said.
"I had tremendous support and everything was amazing.
"I haven't played at home in a long time, so I'm pumped for each match here and hope I can repeat this tomorrow."
Dimitrov, who made the crucial break at 5-5 in the deciding set, will play ninth seed Victor Troicki in the quarter-finals while Basilashvili will take on Martin Klizan, the eighth seed.
Troicki edged out Robin Haase 2-6 6-4 7-6 (7-3) while Klizan saw off qualifier Daniel Brands 7-6 (7-3) 6-2.
Fifth seed Gilles Muller also went through, beating Mikhail Youzhny 6-3 7-5.
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