NEW YORK (AFP) - The Williams sisters, Serena and Venus, had contrasting starts to their US Open campaigns on Monday, while dangerous floater Kim Clijsters kept her comeback march firmly on track. Elsewhere it was a day without upsets as the bottom half of the women's draw completed first-round action. Serena, winner of three of the last four Grand Slam events, seldom had to play at her best as she breezed past fellow American Alexa Glatch 6-4, 6-1 in an afternoon match. Venus, though, was given an almighty scare by Russia's Vera Dushevina in the night session on the Arthur Ashe Stadium central court. Hobbled by an injury to her left knee and short of form, the third seed was a set and 4-5 down before she managed to turn the tide just in time and run out a 6-7 (5/7), 7-5, 6-3 winner in a match that lasted a marathon 2 hours 43 minutes. "Once I was down 1-3 in the second set I just tried to stay focused and not unravel and not go for the big shots," Williams said. "The crowd really helped at 4-5 it was just one of those great New York moments." Asked how bad she was suffering from the knee injury, Williams was evasive, saying only: "I never get into details about the injuries I have. "You could see that I had issues and I am going to do my best to get 100 percent for the next match. I won't be complaining." Serena, looking for her fourth US Open crown and 12th Grand Slam title in all, was more forthcoming in talking about her new autobiography "On the Line" or her designer skills in fashion and jewelry than she was on the state of her game. What bugged her especially was the fact that her cinematic career has hit the skids. "I would love to do acting, but I havent been able to get a job," she said. "I figure if I write my own script then I can star in it. That's what I'm trying now. "I haven't been cast recently - it's tough out there." Next up for Serena is 51st-ranked Hungarian Melina Czink, although both she and Venus will be casting anxious glances over their shoulders in the direction of Clijsters whose comeback after more than two years of retirement is gathering pace. In the same half of the draw, she could meet Venus in the quarter-finals and Serena in the semis if she can reproduce the form that swept aside Ukraine's Viktoriya Kutozova 6-1, 6-1 in the first round. Clijsters moved to six wins against two losses since she returned to action in early August after more than two years' retirement during which she married and had a baby daughter. It was her first match at the US Open since she defeated Mary Pierce in straight sets to win the 2005 crown and though she admitted to being "a little more nervous than usual" she was delighted with the outcome. "I felt really good out there," she said. "Now it's a matter of trying to keep this going." Keeping it going will next entail going against French 14th seed Marion Bartoli, the player she beat in straight sets in her first comeback match in Cincinnati. "She's had really good results in the past, has beaten a lot of good players, but I still think her weakness is her movement," she said. Also coasting through early on the first day were Belarussian eighth seed Victoria Azarenka, who defeated Alexandra Dulgheru of Romania 6-1, 6-1; Polish 12th seed Agnieszka Radwanska, who ousted Patricia Mayr of Austria 6-1, 6-2 and in-form Italian 10th seed Flavia Pennetta a 6-4, 6-0 winner over Edina Gallovits of Romania. It was a far tougher opener for Australia's 15th seed Samantha Stosur, who was taken all the way by 34-year-old Japanese veteran Ai Sugiyama before winning 6-4, 4-6, 6-4.