No. 62 Christina McHale versus No. 10 Caroline Wozniacki: One of the biggest headlines produced by a tennis player in recent days was the announcement that Wozniacki is engaged to golfer Rory McIlroy. The Dane, who was ranked No. 1 for 67 weeks, hasn't been the force she once was, but she's reached at least the fourth round in Melbourne three years running. McHale, a 21-year-old from New Jersey, would equal her best Grand Slam effort with a win Thursday. It could happen; she holds a 2-1 head-to-head advantage, including a 2012 win on the grass at Eastbourne.
No. 50 Varvara Lepchenko versus No. 11 Simona Halep: The two have never met, but Halep is coming off a breakthrough season. The 22-year-old Romanian won the first six singles titles of her career; only Williams won more. Lepchenko, who posted a career-best No. 21 ranking in 2012, slipped to No. 53 last season.
No. 91 Donald Young versus No. 24 Andreas Seppi: It seems like the Donald has been around forever, but he's still only 24. That's how it goes when you turn professional at the age of 15. Young is trying to reach the third round in Melbourne for the first time in five tries. Seppi took out Aussie favorite Lleyton Hewitt in a barn burner of a first-round, five-set match that went more than four hours.
No. 95 Jack Sock versus No. 25 Gael Monfils: A year ago, the 21-year-old Lincoln, Neb., product fell in the first round of qualifying in both Brisbane and Melbourne. "Little bit of a disaster for me down here," he said after beating No. 12-ranked Tommy Haas a week ago in Auckland. "Coming in this year, I'm definitely in a better position." Sock beat Germany's Tobias Kamke in his first-round match. This is his first Australian Open main draw. The elastic Frenchman Monfils has reached at least the third round in Melbourne the past six times he played.