There was no slip up from top seed Dominic Thiem, but the same could not be said of Feliciano Lopez and Fernando Verdasco at the Qatar Open.
Andy Murray sought out Nick Kyrigos for a practice hit at the Brisbane International, but the 8am get up did not work for the Australian.
Seeking to shake off an elbow problem to compete at the Australian Open, Novak Djokovic will use the Kooyong Classic as a proving ground.
Germany are close to reaching the Hopman Cup final as Alexander Zverev and Angelique Kerber impressed against Canada.
Wins for Elina Svitolina and Karolina Pliskova ensured the seeds sidestepped any shocks at the Brisbane International.
Progression to the quarter-finals of the Shenzhen Open means Simona Halep is guaranteed to be the number one seed at the Australian Open.
Milos Raonic was the victim of a crowd-pleasing upset at the Brisbane International, where 18-year-old Alex De Minaur ousted the Canadian.
All three seeds in action on Wednesday avoided upsets as Caroline Wozniacki led the favourites into the last eight at the Auckland Classic.
Pablo Carreno Busta was playing in the ATP Finals under two months ago, but on Tuesday was eliminated from the Qatar Open by Borna Coric.
Roger Federer led Switzerland to Hopman Cup victory over Russia, while Pat Cash made a surprise doubles appearance in Perth.