Andy Murray continued his return to top-level action by reaching the quarter-finals of the European Open in Antwerp with a straight-sets victory over Pablo Cuevas.
The former world number one, now ranked 243rd as he battles back from hip surgery, saw off the Uruguayan 6-4 6-3 in just under 84 minutes.
World number 45 Cuevas saved seven break points in the first set but was eventually undone in the 10th game and Murray claimed another decisive break in the ninth game of the second set.
Otherwise it was a day of surprises in Belgium as the top three seeds all went out.
Top seed Gael Monfils of France was stunned 6-3 6-2 by Italian wildcard Jannik Sinner while second seed David Goffin of Belgium went down 6-3 6-1 to Frenchman Ugo Humbert.
Murray's next opponent was confirmed as Romanian qualifier Marius Copil beat third seed Diego Schwartzman 6-4 5-7 7-6.
The day's other match saw American Frances Tiafoe beat seventh seed Jan-Lennard Struff 6-3 6-4.
Former world number eight Janko Tipsarevic rolled back the years at the Instrum Stockholm Open by postponing his retirement with a brilliant 6-1 6-1 thrashing of top seed Fabio Fognini.
The 35-year-old Serbian, who is playing in his final ATP tournament, powered victory in 62 minutes over the world number 12.
There were also wins for fourth seed Denis Shapovalov and fifth seed Pablo Carreno Busta, over Alexei Popyrin and Gianluca Mager respectively. Japanese lucky loser Yuichi Sugita also went through by beating Stefano Travaglia.
At the KTB Kremlin Cup in Moscow, sixth seed Andrey Rublev came through a two-and-a-quarter-hour battle with Egor Gerasimov of Belarus to reach the last eight.
After the first two sets went to tie-breaks, Rublev eventually prevailed 7-6 6-7 6-2.
Frenchman Jeremy Chardy put out eighth seed Miomir Kecmanovic 6-3 6-4 and lucky loser Nikola Milojevic continued his run with a 7-5 6-0 victory over Alen Avidzba.