Third seed Stefanos Tsitsipas' strong service game saw him overcome John Millman at the Stockholm Open, while teenager Denis Shapovalov also advanced in Sweden on Wednesday.
Tsitsipas, a two-time finalist on the ATP Tour this year, lost just eight points on his first serve in a 6-4 3-6 6-3 win over US Open quarter-finalist Millman that ensured he reached the last eight.
"I had a good start, got the break and thought it was a good start," the Greek said in quotes published on the ATP's website.
"I started playing defensively in the second set and got broken twice. It didn't affect me losing the second set, but I got closer to his serve in the third set and broke at 4-3."
Shapovalov, 19, won an all-Canadian clash with Peter Polansky 6-3 5-7 7-5 to record his 35th victory of the campaign.
"It was definitely a tough match, I knew it was going to be going in – having played him a few times earlier in my career," he said.
Jack Sock and Australian Open semi-finalist Chung Hyeon also won their last-16 matches on Wednesday.
At the European Open in Belgium, French pair Gilles Simon and Richard Gasquet progressed but Milos Raonic was dumped out by compatriot Vasek Pospisil 7-6 (7-3) 7-5.
Feliciano Lopez is also out as Jan-Lennard Struff won the breaker in a 6-1 3-6 7-6 (7-3) success.
Top seed Marco Cecchinato fell at the Kremlin Cup as he was dispatched 6-2 6-3 by Adrian Mannarino, while Benoit Paire lost in straight sets to Egor Gerasimov.
24 de enero 2019
|Pacers earn big win over Raptors, Oladipo injured|
|Harden pleased to entertain Knicks fans in 61-point display|
|Kvitova overcomes extreme heat for spot in Aus Open final|
|Man United have their club back – Scholes revels in Solskjaer revival|
|Harden matches another Chamberlain feat with 61-point game|
|Capitals give up fourth hat-trick in five games|
|Durant leaving Warriors would be ´great´ for NBA, says McGrady|
|McEnroe: Serena choked in Australian Open loss|
|De Jong an ´important addition´ at Barca, says Valverde|
|´Better outcome than we originally feared´ – Agent on Anthony Davis injury|
|Pacers sweating on Oladipo injury after Indiana star leaves on stretcher|
|De Jong: I spoke to PSG and City before signing for Barca|
|Guardiola wants finals habit at Man City|
|Lakers star LeBron won´t face Timberwolves|
|Valverde doesn´t regret resting Messi despite Barcelona loss|
|In my heart and in my prayers - Ben Yedder pays tribute to missing Sala|
|Real Madrid reclaim world´s highest-earning club title from Manchester United|
|Messi absence no excuse for Barcelona loss, says Suarez|
|Humble Higuain excited by Sarri reunion|
|He must not come and cry after – Goncalves unapologetic over Neymar injury|
|Serie A record-breaker under Sarri - the Opta numbers behind new Chelsea striker Higuain|
|PSG boss Tuchel ´worried´ after Neymar sent to hospital with another foot injury|
|Coles commits to New Zealand and Hurricanes until 2021|
23 de enero 2019
|Guardiola praises City mentality on ´dangerous´ Burton pitch|
|England won ´attritional´ battle, says Anderson after latest landmark|
|AEK, Brose Bamberg secure last-16 spots|
|Sevilla 2 Barcelona 0: Resting Messi backfires for Copa del Rey holders|
|Sarri: Chelsea players agree with me on motivation comments|
|Morata asked to leave Chelsea a month ago, says Sarri|
|Paris Saint-Germain 2 Strasbourg 0: Neymar suffers injury scare in Coupe victory|
|Anderson´s four-wicket haul rocks Windies|
|Burton Albion 0 Manchester City 1 (0-10 agg): Holders coast through to clinch Wembley return|
|PSG´s Neymar hobbles off in Coupe de France clash|
|De Ligt bored of Ajax departure rumours|
|Piatek completes AC Milan move after Higuain exit|
|Super Bowl LIII: Rams RBs v Patriots RBs|
|Chelsea seal Higuain loan|
|Ismaily kicked out of CAF Champions League after fans throw stones, bottles|
|England star Itoje pens new Saracens deal|
|Palace keeper Hennessey charged over Instagram post|
|Chelsea warn supporters over anti-Semitic chanting ahead of Tottenham EFL Cup tie|
|Joshua primed to make call on next opponent|
|Super Bowl LIII: Brady v Goff|
|Sala search suspended as Cardiff chairman confirms club wanted different travel arrangements|
|Cruyff, Koeman, Kluivert - De Jong following pantheon of Dutch Barca greats|
|Sarfraz apologises for comments picked up by stump mic|
|Djokovic: Pouille deserves top-10 spot|
|Hazard must be more demanding if he wants to leave Chelsea, says Ballack|
|Celtics´ Kyrie Irving to sit out Cavs game with flu-like symptoms|
|Barcelona seal €86m De Jong deal|
|Vietnam v Japan: Moriyasu happy to keep doing just enough|
|Hendricks, De Kock and Steyn join up with Proteas squad|
|Lorenzo excited for ´new level´ at Repsol Honda|
|Fernando replaces injured Pradeep in Sri Lanka squad|
|China v Iran: Queiroz wants to exorcise 2015 quarter-final|
|Balotelli joins Marseille until the end of the season|
|Emery gives Monchi ringing endorsement amid Arsenal sporting director links|
|Larry Fitzgerald returning to Cardinals on one-year deal|
|Watson absence ´an opportunity´ for Scotland hopefuls, says Townsend|
|Pochettino open to new signings but Janssen to remain a Spurs outcast|
|´No trace´ of aircraft so far in Sala search|
|Pochettino will not judge Sarri for criticising Chelsea players|
|From front row to four in a row - Best takes on Farrell at Connect 4|
|Hazard an individual, not a leader - Sarri urges Chelsea star to do more|
|Broad left out of England team for first Test|
|Higuain set to sign for Chelsea but won´t face Tottenham – Sarri|
|McGillvary injury blow for Giants|
|Solari praises Marcelo amid exit rumours|
|A-League Review: Joy and pain for De Jong as Sydney close gap|
|Halfpenny, Davies and Williams set to miss France clash|