The defending Los Cabos champion Fabio Fognini had to work hard to reach another quarter-final in Mexico, beating Marcel Granollers 4-6, 6-3, 6-4 in two hours and eight minutes. The Italian couldn't find the rhythm behind the initial shot, facing 12 break points and suffering four breaks to offer Granollers a chance for an upset.
The Spaniard gave his best to seize it but it wasn't enough in the end, getting broken twice in the decider to push Fabio into the last eight. An in-form American Taylor Fritz will meet Fognini there, ousting Prajnesh Gunneswaran 4-6, 6-3, 6-2 in an hour and 45 minutes.
The American repelled five out of six break chances, playing better and better as the match progressed to leave Prajnesh behind with a flawless performance in the decider, losing three points on serve and earning two breaks to book the spot in the quarters.
A former finalist Thanasi Kokkinakis is through to the first ATP quarter-final since Los Cabos in 2017, toppling the 4th seed Lucas Pouille 2-6, 6-4, 6-3 in two hours. The young Aussie fired 12 aces and got broken twice in the opener before settling into a rhythm that Pouille failed to follow, dropping 11 points behind the initial shot in sets two and three to sail through his service games and breaking Lucas three times to advance into the next round.
The 7th seed Radu Albot proved to be too strong for Taro Daniel, notching a 6-1, 6-2 triumph in an hour and 13 minutes for the 24th victory in 2019. Mikhail Kukushkin overpowered Cameron Norrie 7-5, 7-5 in an hour and 34 minutes, getting broken two times and securing twice as many on the other side to prevail in straight sets, trailing a break in the closing stages of both sets before rattling off three games from a 4-5 down to emerge at the top.
The 3rd seed Diego Schwartzman ousted Ernests Gulbis 7-5, 6-0 in an hour and 26 minutes, fending off all six break points and rattling off the last nine games from 4-5 to race towards the finish line and join the other competitors in the next round.
The young Korean qualifier Soonwoo Kwon took down Juan Ignacio Londero 6-4, 3-6, 6-3 for the first ATP quarter-final, taking four of the last five games for another significant triumph and the place in the top-100 on Monday.
The 2nd seed Guido Pella was too strong for the struggling Bulgarian Grigor Dimitrov, securing a 6-4, 6-2 win in an hour and 12 minutes with an excellent performance on the return and five breaks on his tally. The Bulgarian is now 12-13 in 2019 and will have to raise his level significantly if he wants to return into the top-50, losing ground on serve completely and not being able to overcome the better-ranked rivals at the moment.