Richard Gasquet, Tommy Haas and Phillip Kohlschreiber won their third-round matches at the Gerry Weber Open in Halle.
Third seed Juan Martin Del Potro survived a scare to progress through to the third round of Queen's, beating Xavier Malisse.
Round-up: Rafael Nadal was forced to dig deep into his near bottomless resolve to salvage a win over Daniel Brands.
The full schedule for the second day at Roland Garros, with defending champion Rafa Nadal in action.
Kei Nishikori is closing in on a third-round clash against Roger Federer after beating Jergen Melzer 6-3 6-2 at the Madrid Open.
Milos Raonic said he needed to iron out "crucial mistakes" after he squeaked past former world number three Nikolay Davydenko.
Top seed Marion Bartoli bowed out of the Oeiras Open in Estoril in the first round after losing 0-6 6-1 4-6 to Shuai Peng.
Novak Djokovic avoided becoming the latest big-name casualty at the Monte Carlo Masters in a 4-6 6-2 6-2 win over Juan Monaco.
Novak Djokovic struggled but Rafael Nadal and Andy Murray launched their Monte Carlo Masters campaigns with comfortable wins.
Juan Martin Del Potro moved into the third round of the Monte Carlo Masters with a 1-6 6-4 6-3 win over Alexandr Dolgopolov.
John Isner prevailed in an all-American battle with Ryan Harrison to kick off his ATP Houston campaign on a winning note.
Roger Federer dropped the first set to beat Malek Jaziri 5-7 6-0 6-2 in the Dubai Championships first round.
Round-up: World number 10 Richard Gasquet was dumped out of ATP Marseille in the opening round.
Top seed Marin Cilic clinched his third ATP Zagreb title with a 6-3 6-1 victory over Jurgen Melzer on Sunday.
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