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.
|FSF urges Premier League clubs to reject Scudamore ´golden handshake´ request|
|Rhinos pull off Merrin coup|
|Ribery apologises for reporter altercation|
|Ford to captain much-changed England, Cokanasiga starts|
|Crotty replaces injured Williams for Ireland showdown|
|Classy Roshen gives Sri Lanka unlikely lead|
|Injured Lukaku out of Belgium-Iceland Nations League clash|
|Rooney ´passionate´ about future coaching career|
|Mehidy spins Tigers to victory despite second Taylor hundred|
|Rooney deserves special England day - Antonio|
|LeBron thinks back to his roots after latest milestone|
|Messi to return for Argentina next year - General manager Burruchaga|
|Walton salutes LeBron after he surpasses Chamberlain|
|Croatia´s Dalic and Modric not out for Spain revenge|
|Rondo to miss ´a few weeks´ with broken hand|
|Gabi, Juanfran hopeful over Oblak´s Atletico future|
|England rookie Wilson not comparing himself to Kane|
|WATCH: The baskets that moved LeBron James up the all-time NBA scoring list|
|LeBron moves into fifth on scoring list, 76ers fall in Butler´s debut|
|LeBron James into top five NBA scorers: Five quotes from league legends on his greatness|
|LeBron passes Chamberlain for fifth on all-time scoring list|
|Butler: 76ers need time to gel|
|South Africa lose 28-9 in Windies defeat|
|Delph impressed by ´special´ Sancho|
|Bolt may give up on football career despite ´a lot of offers´|
|We´re better than Dortmund – Wagner urges Bayern to respond|
|Raptors fans give former coach Casey standing ovation in return|
|Martinez hails Hazard leadership|
|Muller going through ´difficult´ period, says Low|
|Betances wants Yankees to sign Machado|
|Rays´ Snell, Mets´ deGrom win Cy Young Awards|
|Dinwiddie to debut Stan Lee-inspired shoes against Heat|
|Iberostar Tenerife and Segafredo Virtus Bologna stay perfect in BCL|
|Rooney wanted to finish career at Manchester United|
|Red Sox give manager Cora contract extension through at least 2021|
|WATCH: Ronnie O´Sullivan hits blue with calamitous break-off shot|
|Matuidi: Mbappe has a great personality, like Ronaldo, Messi and Zlatan|
|Cilic beats Isner to hand Djokovic semi-final spot|
|Mendy undergoes knee surgery|
|Warriors´ Curry will not play during three-game road trip|
|Ramos refuses to retaliate after Lovren jibe|
|Qatar pull off shock win over Switzerland|
|Tuilagi could make England return against Australia|
|Rooney has earned England reward - Sarachan|
|Croatia thrashing means nothing now – Luis Enrique|
|Chelsea and Everton among Arnautovic suitors, claims agent|
|TJ Watt hopes to win NFL sacks race with brother JJ|
|Modric defends Ramos after Lovren comments|
|Southgate hails ´outstanding´ Delph as he talks up England strength in depth|
|No war with Manchester United over Fellaini, insists Martinez|
|Rooney to wear number 10 shirt against USA and receive armband from Delph|
|I don´t feel pressure of Liverpool expectations, claims Klopp|
|Steelers´ Roethlisberger texted Bell but ´didn’t hear back´|
|Reus and Kroos to sit out Germany´s clash with Russia|
|Van Dijk happy to recommend De Ligt if Liverpool ask|
|Sauber announce launch of junior programme|
|No ´breathtaking tennis´ in Djokovic´s win against Zverev|
|Curran: England spinners will be key in Kandy|
|Djokovic charges past Zverev to move closer to ATP Finals progression|
|Messi is a football alien - Malcom|
|Sky´s the limit for Sancho, says Dortmund team-mate Pulisic|
|Radwanska retires from tennis at 29|
|Maybe one day - Pulisic open to Premier League move|
|Suso ´proud´ of Real Madrid speculation but happy at AC Milan|
|Betis president convinced Lo Celso will stay|
|Injured Holder out of Bangladesh tour|
|Germany face relegation, final spots up for grabs - Nations League state of play|
|James Rodriguez out for several weeks with knee injury|
|Curran´s brilliant fifty rescues England´s innings|
|Lenglet: No problem with Dembele at Barca|