A mixed Monday saw the seeds worked hard at the German Tennis Championships in Hamburg, with Diego Schwartzman earning a rare win.
Home hopeful Vera Zvonareva swiftly departed the Moscow River Cup as Aliaksandra Sasnovich reached the second round on Monday.
Roger Federer is the first top-10 men's player to withdraw from the Rogers Cup.
For the second time this year Marco Cecchinato was celebrating an ATP World Tour title after lifting the Croatia Open Umag trophy.
A 7-5 3-6 6-2 defeat of Ramkumar Ramanathan in the Hall of Fame Championships final gave Steve Johnson the fourth ATP title of his career.
Petra Martic had no answer to top seed Anastasija Sevastova in the Bucharest Open final on Sunday.
Richard Gasquet was ultimately no match for Fabio Fognini in Bastad on Sunday, as the Italian beat him to win the Swedish Open.
Alize Cornet claimed her first title since January 2016 at the expense of first-time finalist Mandy Minella on the clay.
French Open semi-finalist Marco Cecchinato will meet Guido Pella in the Croatia Open Umag final, while Steve Johnson won again in Newport.
Richard Gasquet and Fabio Fognini will go head-to-head in Sunday's Swedish Open final after semi-final victories in Bastad.