William West, Getty Images
Justine Henin powers back a return against Olga Poutchkova at the Australian Open on Tuesday.

MELBOURNE, Australia — Win No. 30 in Justine Henin's current streak gave her a few things to work on in her next match at the Australian Open.

Top-ranked Henin, who skipped Melbourne last year because she was going through a divorce and had to default in the 2006 final because of a stomach illness, needed four match points to clinch Wednesday's 6-1, 7-5 second-round win over Russian Olga Poutchkova.

Two U.S. men lost early Wednesday.

Frenchman Jo-Wilfried Tsonga followed his opening-round upset over No. 9 Andy Murray by hitting 54 winners and 14 aces in a 6-4, 7-6 (4), 6-2 win over Sam Warburg.

No. 24 Jarkko Nieminen of Finland beat Jesse Levine 6-2, 7-5, 7-6 (2).

Venus Williams, who beat Marion Bartoli in the Wimbledon final, played her first match in three years at the Australian Open on Tuesday night.

She downed China's Yan Zi 6-2, 7-5 but hit 29 unforced errors and only 19 winners.

"Errors happen," Williams said. "That's tennis."

Roger Federer wasted no time in the start of his bid for a third consecutive Australian Open title.

Sick and tired of talk about his stomach bug, Federer wanted to show he was in Grand Slam form.

He left no doubts with a 6-0, 6-3, 6-0 win over Argentina's Diego Hartfield on Tuesday night. In eight previous trips to Melbourne, he had never swept the opening set.

KUERTEN RETIRING AFTER FRENCH: Three-time French Open champion Gustavo "Guga" Kuerten will retire from professional tennis after playing at Roland Garros this year. Kuerten will enter only six tournaments in 2008 before ending his 14-year career, the Brazilian said in a news conference on Tuesday.