Former champions Andre Agassi and Lindsay Davenport declared themselves certain starters for the Australian Open but Russian Elena Dementieva remained in doubt on Sunday as she battled to recover from heat illness.Serena Williams, the 2003 women’s champion in Melbourne, opens the action on Monday against Frenchwoman Camille Pin in an injury-hit women’s singles draw which is without last year’s finalists Justine Henin-Hardenne and Kim Clijsters.Defending champion Roger Federer is to follow Williams on to Rod Laver Arena at Melbourne Park, where he will begin his title defence against French veteran Fabrice Santoro.With Henin-Hardenne, Clijsters and former champion Jennifer Capriati all out injured, organisers of the season-opening Grand Slam breathed a sigh of relief when American star Davenport gave them the thumbs up after a bout of bronchitis in Sydney last week.Davenport, the top seed and 2000 Australian Open champion, managed only one match at the Sydney International but said she had recovered after two days of rest and some practice.Agassi, whose late-blooming love affair with Melbourne began in 1995 with the first of his four titles, is seeded eighth this year and will face German qualifier Dieter Kindlmann in the opening round on Monday. Key contests