Viktor Troicki had to save match points in the last qualifying round to secure the place in the main draw, defeating Jozef Kovalik 7-6, 6-4 for the first ATP win since the Australian Open. The Serb lost 15 points on serve, suffering two breaks in the middle stage of the second set when they traded four breaks in a row, prevailing with a late break in the tenth game to book the spot in round two.
The 6th seed Ugo Humbert ousted Federico Delbonis 6-3, 7-5 in an hour and 18 minutes, losing serve once and delivering three breaks for the sixth ATP win in 2019, trailing 5-4 in set number two before taking the final three games to cross the finish line first.
Bradley Klahn earned the first win on the ATP level since Stockholm last year, toppling a qualifier Steve Darcis 6-3, 6-2 in an hour and four minutes. The American fired 12 aces and fended off all four break points, mounting the pressure on the Belgian who suffered three breaks to finish his journey in the first round.
World no. 443 Altug Celikbilek stunned Ernests Gulbis 6-3, 4-6, 6-4 in just under two hours, taking five points more than the Latvian and prevailing with a break in the seventh game of the decider to secure the first win in the ATP tournament for Turkey in two years.
The 5th seed and defending champion Damir Dzumhur took down Matthew Ebden 6-4, 7-5 in an hour and 22 minutes, winning only two points more than the Aussie and prevailing in the crucial moments to take the last three games for the sixth triumph in 2019.
Bernard Tomic celebrated the fourth win of the season on the main level, sending out the 7th seed Andreas Seppi 4-6, 6-4, 6-4 in two hours and seven minutes, blasting 24 aces and fending off 11 out of 13 break points, serving well in the deciding set and moving over the top with a break at 5-4 to reach the second round.
Prajnesh Gunneswaran defeated Janko Tipsarevic 6-0, 7-6 in an hour and 17 minutes, saving two break points in the opener before claiming it 6-0 and fending off a set point in the second set tie break at 5-6, taking the last three points to seal the deal in straight sets for the third ATP victory in 2019.