Another sunny day with temperatures in the 70s saw half of the men's and women's quarterfinals completed -- with the other four scheduled for today.
• Sixth-seeded Andy Roddick struggled with a shoulder injury in a five-set loss to Marin Cilic in the first men's quarterfinal. The 27-year-old American rallied from two sets down to force a fifth set -- and had a triple break point in the first game -- but the 14th-seeded Croatian held strong and escaped with the victory.
• Defending champion Rafael Nadal retired with an injured knee against Andy Murray in the third set of their quarterfinal clash. Nadal was trailing 6-3, 7-6 (2), 3-0 when he conceded. (Nadal confirmed it's the same knee problem that hampered him last year.) Murray faces Cilic in Thursday's men's semifinals -- a rematch of their fourth-round meeting at last year's U.S. Open which Cilic won in straight sets.
• Seven-time Grand Slam winner Justine Henin booked a place in the semis with an admittedly difficult 7-6 (3), 7-5 victory over Nadia Petrova.
• Chinese dark horse Jie Zheng continued her surprise run with a victory in straight sets over Maria Kirlenko, who bemoaned her serve problems. Zheng faces Henin in Thursday's women's semifinals.
• Match of the Day: Roddick's gutsy comeback -- and eventual surrender -- made for compelling theater opposite Cilic.
Former British No. 1 Tim Henman's column for BBC Sport on Murray's victory over Nadal ... Doubles star Zi Yan talks about the success of Chinese players of this year's Aussie Open ... What does the future hold for Nadal? The talking heads discuss ... From the Reuters global sports blog: Can Murray end Britain's 74-year wait for a men's Grand Slam champ? ... Two ordinary Sydney dads played a 37-hour singles match yesterday and set a Guinness World Record ... Diet like a Diva and meet Venus and Serena.
Photo of the Day
25 ... Number of Grand Slams since an American man has won a Grand Slam singles title after Roddick's elimination on Tuesday, an Open Era record.
33 ... Years since a British player last made the semifinals at the Australian Open.
10 ... Length in minutes of the delay midway through the Murray-Nadal quarterfinal for Australia Day fireworks.
Tweet of the Day
"Jenny has had an epideral(sp?) and things have improved a ton! Nothing really exciting yet, still a bunch of waiting. Epideral for the win!!"
--Taylor Dent, back in the U.S. with his pregnant wife after last week's second-round loss, live-tweeting from the delivery room, Tuesday, 10:54 a.m. ET
Highlights from Murray's quarterfinal victory over Nadal.
What's Happening Today
The Tennis Channel's live coverage begins at 7 p.m. ET, with ESPN2 picking it up at 9 p.m. through 8 a.m. on Wednesday morning.
American viewers can see both Williams sisters without compromising the sleep schedule too much: Venus Williams faces Na Li in the first quarterfinal at 7 p.m. ET, with Serena Williams meeting Victoria Azarenka around 9 p.m.
Top-seeded Roger Federer faces No. 6 Nikolay Davydenko in the day's first men's quarterfinal around midnight on the East Coast, while Novak Djokovic and Jo-Wilfried Tsonga complete the men's semifinal field at 3:30 a.m.
The compete order of play for Day 10 can be found here.
They Said It
"I go to the limit, but not cross the limit, no?"
--Nadal, on the knee injury that forced his retirement against Murray
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