Caroline Wozniacki made the ideal start to the defence of her Pilot Pen title as she crushed Edina Gallovits.
The second seed did not give her Romanian rival a chance as she raced to a 6-0 6-0 victory in Connecticut.
Fellow seeds Marion Bartoli and Flavia Pennetta also reached the second round - although the duo had contrasting battles.
Sixth seed Bartoli had to come back from a set down before seeing off Spaniard Marfa Jose Martinez 4-6 6-3 6-1.
Pennetta, seeded third, was simply strong for Romanian Raluca Olaru as she raced to a 6-1 6-2 victory in double quick time.
Australian Samantha Stosur needed three sets to edge past Alize Cornet 6-7 (8-10) 6-2 6-4 and into the second round.
Anna Chakvetadze, who was beaten by Wozniacki in the 2008 final, is through to third round with a battling 4-6 6-4 7-5 victory over Sybille Bammer.
And eighth-seeded Amelie Mauresmo joined the Russian in the third round as she brushed aside Alona Bondarenko 6-1 6-1.
Read what Sky Sports' experts and bloggers have been talking about over the last seven days in sport...
Who are the champs and the chumps of the sporting week? skysports.com takes you through it.
After his second successive final defeat, will Andy Murray ever land a Grand Slam title? It's Your View...