MELBOURNE, Australia (AP) — A rusty Novak Djokovic began his bid for a fourth consecutive Australian Open title on Monday with a win over Lukas Lacko while Serena Williams looked as polished as ever beating Australian teenager Ashleigh Barty.
With his new coach and six-time Grand Slam singles champion Boris Becker watching him during an official match for the first time, Djokovic appeared tentative early against the Slovakian player, who often appeared content to keep the ball in play.
But as the second-seeded Djokovic's patience level began to drop, his skill level stepped up. He stayed on course for a fifth Australian title with a 6-5, 7-6 (2), 6-1 win, hoping to be the first man to achieve that feat since the Open Era began in 1968.
Top-ranked Williams won her 23rd consecutive match — including 18 at the end of last season and four last week in winning the Brisbane International — after beating Barty 6-2, 6-1 in 57 minutes.
"You have to be ready," Williams said. "She had nothing to lose."
Williams continues to be in rarified territory. Her Brisbane title was the 58th of her career — she won 11 last year, including the French Open and U.S. Open. A five-time winner of the Australian Open, she's trying to end Victoria Azarenka's two-year run as women's champion at Melbourne Park.
Williams won 10 of 11 points at the net during the Barty match, but tried to dowse expectations that she'll vacate her usual place at the baseline.
"In my mind I've been at the net (previously), but now I'm physically going there a little more," Williams said. "No pressure. My next match I might stay at the baseline the whole time. It's nothing I'm permanently working on. I'm just trying to have fun and do what I want to do out there."
Djokovic also had a strong finish to 2013, entering the tournament on a 24-match winning streak, which followed his loss to Rafael Nadal in last year's U.S. Open final. He's now also on a 22-match winning streak at Melbourne Park.
"It is the first competitive match I've had this season, I haven't played for five or six weeks," Djokovic said. "I was a bit rusty on the court the first two sets. Afterwards it was all working well."
Serena's sister, Venus Williams, started well earlier Monday but unforced errors in two key periods in her match sent the seven-time major winner out of the tournament.
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