John Isner moved into the quarter-finals of the Atlanta Open with a comeback victory over home favourite Robby Ginepri.
Top seed Fabio Fognini marched into the quarter-finals of the Croatia Open by beating Albert Montanes in Umag.
Mikhail Youzhny made a comfortable start to his Swiss Open title defence after dispatching Frenchman Kenny De Schepper.
Stefanie Voegele served up a second round shock as she dumped top seed Sorana Cirstea out of the Baku Cup.
Andy Murray is set to continue his ground-breaking partnership with coach Amelie Mauresmo.
Reigning Wimbledon men's doubles champions Vasek Pospisil and Jack Sock made their singles mark in the Atlanta Open.
Guillermo Garcia-Lopez and Federico Delbonis both crashed out unexpectedly in the second round of the Swiss Open.
Home favourite Marin Cilic cruised through to the quarter-finals at the Croatia Open with victory over Igor Sijsling.
France's Pauline Parmentier upset the odds by beating eighth-seed Slovak Jana Cepelova in the Baku Cup.
Our Andy Schooler says there's something not right about Victor Troicki's wild card in Gstaad this week.