American John Isner has beaten Jordan Thompson in straight sets at the ATP event in New York, a day after eliminating another Aussie in Bernard Tomic.
2015 champion Stan Wawrinka has set up a semi-final contest with top-seed Kei Nishikori in Rotterdam after both were comfortable winners in the quarters.
Top seed Simona Halep has beaten Elina Svitolina in three sets to book her place in the Qatar Open final against the unseeded Elise Mertens.
Spain's Guillermo Garcia-Lopez has eliminated Australian world No.37 John Millman with an upset second-round win at the ATP 250 event in New York City.
Simona Halep has beaten Germany's Julia Goerges 7-6(1) 7-6(6) to move into a semi-final showdown with Elina Svitolina at the Qatar Open.
Lucky loser Alexei Popyrin has been bundled out of the New York Open with a straight sets first-round defeat to Spain's Guillermo Garcia-Lopez.
Australian Bernard Tomic has won first ATP Tour match since September, beating Lukas Lacko, while Jordan Thompson also won at the New York Open.
Australian world No.41 Ajla Tomljanovic has won her way into the Qatar Open's main draw but Samantha Stosur's campaign in Doha ended in qualifying.
Australian captain Alicia Molik's surprise move to pair Ash Barty with Priscilla Hon in the deciding Fed Cup rubber against the US has proved a masterstroke.