Parent power ruled at the U.S.Tennis Open in New York on opening day.
Defending men's champion Roger Federer and former women's world number one Kim Clijsters put their young upstart opponents firmly in their places to storm into the second round at Flushing Meadows.
Federer, chasing his third successive major following his triumphs at the French Open and Wimbledon, and Clijsters were both playing their first grand slam tournament following the births of their respective children.
For Clijsters, it marked her first major since the 2007 Australian Open but despite being off the scene for more than two years went through to the second round in less than an hour, winning 6-1 6-1.
New father Federer, who celebrated the arrival of twin daughters five weeks ago, took an hour and a half to advance 6-1 6-3 7-5.
Meanwhile seven times grand slam winner Venus Williams had to dig deep to avoid what would have been one of the biggest upsets of her career.
one of the most shocking upsets of her illustrious career as she beat little-known in a first-round marathon at the U.S. Open Monday.
Williams was down a set and a service break before coming back to beat little known Russian Vera Dushevina 6-7 7-5 6-3.
Other opening day winners included defending women's champion Serena Williams, Andy Roddick, Leyton Hewitt and former world number one Amelie Mauresmo.