<strong>New York:</strong> American tennis star Serena Williams, four weeks shy of her 41st birthday and playing in her last career event, overcame Danka Kovinic of Montenegro 6-3, 6-3 to secure a place in the second round of the US Open on Tuesday (IST). <p></p> <p></p>Serena Williams will play No.2 seed Anett Kontaveit of Estonia on Wednesday. <p></p> <p></p>The winner of 23 singles titles at majors, Serena has now won 107 matches in New York, and 102 of them have come in Arthur Ashe Stadium, according to wtatennis.com <p></p> <p></p>Williams began tentatively, losing three of the first four points. But she smashed two aces to get even and took the opening game when a Kovinic forehand found the net. The legendary player moved remarkably compared to her stints in Toronto and Cincinnati earlier this month. <p></p> <p></p>"I always feel so comfortable on this court," she said. "When I step on the court I just want to do the best I can. The crowd was crazy. It really helped pull me through," Serena said post-match. <p></p> <p></p>"It's been such a hard decision (to retire). Because when you're passionate about something, love something so much it's hard to walk away. I was just like all right, now's the time. There's other chapters in life. It's going to be Serena 2.0." <p></p> <p></p>Meanwhile, in the first major upset at this year's US Open, qualifier Daria Snigur of Ukraine overcame Romania's Simona Halep in three sets to reach the second round. The 20-year-old Snigur, playing only her third WTA-level match and first at a major, upset the Romanian 6-2, 0-6, 6-4. <p></p> <p></p>"I'm very happy," she said. "I'm very, very, very nervous," she added. "But I tried to do my best."