An in-form American Taylor Fritz made a great start in Los Cabos, beating a qualifier Dominik Koepfer 6-3, 6-4 in 59 minutes. Taylor lost 12 points on serve, never facing a break point and converting two chances on the return, at 3-2 in the first set and 2-2 in the second, moving over the top with a hold at love in the tenth game to secure the 23rd victory of the season.
Taro Daniel wasted no time on the court as well, toppling Tennys Sandgren 6-2, 6-0 in 63 minutes, dominating on both serve and return to deliver five breaks and control the scoreboard all the time. The 7th seed Radu Albot battled past Janko Tipsarevic 7-5, 2-6, 6-0 in two hours and one minute, overcoming a slow second set and storming over Janko in the decider for the 23rd victory in 2019.
Atlanta semi-finalist Cameron Norrie defeated Gregoire Barrere 7-6, 6-0 in an hour and 24 minutes, wasting three set points in the closing stages of the opening set before taking it 7-5 in the tie break, racing towards the finish line after losing only eight points in set number two to secure a bagel.
Juan Ignacio Londero overpowered Cristian Garin 3-6, 6-2, 6-3, losing serve once and leaving Garin behind after the opener to notch the 20th victory of the season. After Atlanta, the young Korean Soonwoo Kwon clinched the second win at ATP tournaments, toppling Gstaad finalist Cedrik-Marcel Stebe 6-2, 6-1 in 71 minutes.
The German didn't have much left in the tank after a long flight and a chance of surface, losing serve four times to propel the rival into the last 16 and further towards the place in the top-100. The struggling Bulgarian Grigor Dimitrov celebrated the first triumph since Roland Garros, prevailing against Steve Johnson 7-6, 4-6, 7-6 in two hours and 28 minutes.
Grigor had to work hard to achieve the 12th victory in 2019, winning only three points more than the American who scored three breaks and got broken twice. Despite that, he had to bow out after the first round, squandering a 5-2 advantage in the first set and coming back from a 5-2 down in the decider, saving a match point before Dimitrov sealed the deal in the tie break, winning it 7-5 for a much-needed triumph and at least some points on his tally.