Singles stars Taylor Fritz and Holger Rune earned a first-round doubles win at the Rolex Monte-Carlo Masters Monday when they moved past Lloyd Glasspool and Jean-Julien Rojer 6-3, 6-3.
It is the second time Fritz and Rune have teamed in Monte-Carlo after they reached the quarter-finals last year.
Italian singles stars Jannik Sinner and Lorenzo Sonego claimed the first set against Sander Gille and Joran Vliegen before the Belgian duo rebounded to win 6-7(3), 7-5, 10-7.
Wesley Koolhof and Nikola Mektic started their quest for their fourth trophy of the season with a 7-5, 5-7, 10-7 win against Hugo Nys and Jan Zielinski after two hours. The seventh seeds will next play Fritz and Rune.
Americans Nathaniel Lammons and Jackson Withrow advanced, defeating Jamie Murray and Michael Venus 6-4, 6-4. Lammons and Withrow are chasing their first title of the season together this week.
Maximo Gonzalez and Andres Molteni also won, beating Nicolas Jarry and Lorenzo Musetti 6-4, 6-3. The eighth seeds won a title on clay in Cordoba earlier this year.
Sander Gille and Joran Vliegen moved past Italians Jannik Sinner and Lorenzo Sonego 6-7(3), 7-5, 10-7. Sinner will make face Alejandro Davidovich Fokina or Sebastian Korda in his opening-round singles match in Monte-Carlo.
Marcelo Arevalo and Mate Pavic made a winning start at the Rolex Monte-Carlo Masters on Sunday when they moved past singles stars Grigor Dimitrov and Sebastian Korda 6-4, 6-4.
The El Salvador-Croatian team won 84 per cent (27/32) of their first-serve points and saved both break points they faced to triumph after 77 minutes. Arevalo and Pavic will next play top seeds Rohan Bopanna and Matthew Ebden.
Earlier this season, Arevalo and Pavic won the title at the ATP 250 hard-court event in Hong Kong.
Karen Khachanov and Andrey Rublev also advanced, defeating Daniil Medvedev and Roman Safiullin 7-6(1), 6-2.