Dominic Thiem remained unbeaten at the Argentina Open, defeating Pablo Cuevas to reach the semi-finals.
Stan Wawrinka beat teenager Denis Shapovalov to reach the last four in Rotterdam, where he will take on top seed Kei Nishikori.
Dominic Thiem is on track for a third Argentina Open title after moving into the last eight.
Daniil Medvedev and Jo-Wilfried Tsonga continued their winning runs and will now meet in Rotterdam after setting up a last-eight encounter.
Top seed John Isner defeated Bernard Tomic en route to the New York Open quarter-finals, having lost his first two matches of 2019.
Having lost to Milos Raonic at the Australian Open, Stan Wawrinka overcame the Canadian in Rotterdam to reach the quarter-finals.
Spanish veteran David Ferrer celebrated his 728th career win following Tuesday's victory against Malek Jaziri.
Having beaten Stan Wawrinka in the Rotterdam Open last year, Tallon Griekspoor added the scalp of world number 11 Karen Khachanov.
There were contrasting fortunes for Bernard Tomic and Tennys Sandgren at the New York Open.
Milos Raonic or Philipp Kohlschreiber await Stan Wawrinka in the second round of the Rotterdam Open after he beat Benoit Paire.