Melbourne, Australia (SportsNetwork.com) - Serena Williams quest for an 18th career singles Grand Slam title will have to wait a few more months. The world No. 1 will have to start a new winning streak too. Serbian Ana Ivanovic stunned Williams, 4-6, 6-3, 6-3 Sunday to reach the quarterfinals of the Australian Open. The 14th-seeded Ivanovic ended Williams 25-match winning streak and dealt the American a shocking fourth-round exit. Ivanovic, who was the runner-up in Melbourne in 2008 and was the French Open champion later that year, took advantage of 31 unforced errors from Williams. "Its not easy playing such a champion and Ive never beaten her before," Ivanovic said during an on-court postmatch interview. Before this match, Ivanovic had lost all four previous matchups against Williams. In fact, she hadnt taken a set against her, but that all changed at Rod Laver Arena. A five-time Australian Open champion, Williams lost for just the second time in 53 matches at the event when winning the first set. Her only previous defeat came last year in the quarterfinals to Sloane Stephens. Williams fought back from a break down to win the first set, but in the second Ivanovic broke for a 3-2 edge. She finally finished off the set on her third chance, a forehand winner. "I had some confidence coming into todays match," Ivanovic said. "I really did certain things extremely well, you know, and I kept her under pressure I felt throughout the whole match." The errors then started to pile up for Williams, as she lost the first three games of the final set. Williams held serve to get within 5-3 and saved one match point when Ivanovic sent a forehand into the net. The encounter finally ended when Williams sent a return long. "I wasnt the best, but it was all Anas day. I thought she played really well," said Williams, who fired 13 aces. "I made a tremendous amount of errors. Im just not used to missing those shots." Williams has been dealing with a back injury, which she termed as not "life threatening" but said she was unable to get additional days off due to the schedule of playing essentially every other day as a Grand Slam tournament requires. She even contemplated not taking the court Sunday due to the injury, but gave Ivanovic all the credit for winning. "I think its almost good I lost today because now I know what I have to work on," added Williams, who pulled out of the doubles competition with her sister, Venus before their first-round match. That was because Venus had a lower left leg injury. Ivanovic will face either 30th seeded Canadian Eugenie Bouchard or Australian Casey Dellacqua in the quarterfinals. Only three players have won 18 Grand Slam singles titles in the Open Era - Chris Evert (18), Martina Navratilova (18) and Steffi Graf (22). Serenas next chance at No. 18 will come at the French Open at the end of May. Fourth seed Li Na of China bested 22nd-seeded Russian Ekaterina Makarova, 6-2, 6-0 in 59 minutes. Li, who lost to Victoria Azarenka in last years finale in Melbourne, will face Italian Flavia Pennetta in the quarterfinals. The 28th-seeded Pennetta, who did not play the 2013 Australian Open due to a wrist injury. upended No. 9 seed Angelique Kerber of Germany, 6-1, 4-6, 7-5. This is Pennettas first quarterfinal appearance at the Aussie Open, but her second straight such showing in a Grand Slam tournament. Pennetta, who fired eight aces, was ousted by Azarenka at the 2013 US Open semifinals. Since 1999, only one German player has advanced to the Australian Open quarterfinals. That was Andrea Petkovic in 2011. Kareem Hunt Jersey .com) - Robert Martin and Josh Hicks combined for more than 300 yards rushing and three touchdowns, as Rutgers rolled past North Carolina, 40-21, in the Quick Lane Bowl. 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Eric Kush Jersey . -- Jacksonville Jaguars running back Maurice Jones-Drew practiced in a limited capacity Friday, a positive sign he might be able to play against the Tennessee Titans.HUMBLE, Texas -- Matt Kuchar didnt have the result he had hoped for while playing in the final pairing at last weeks Texas Open. The six-time PGA Tour winner, who closed with a final-round 75 on his way to a fourth-place finish last week, will have the opportunity to show what he learned from that disappointing finish at this weeks Houston Open. Playing in the final pairing, Kuchar vaulted past a struggling Sergio Garcia with a 4-under par 68 on Saturday -- overcoming windy conditions at the Golf Club of Houston to match the low round of the day and take a four-shot lead after three rounds. Kuchar stands at 15 under overall heading into Sundays final round, four shots ahead of second-round leader Garcia and Cameron Tringale. The three will be paired together on Sunday. "Its a nice position to have played well last week, to have been in the last group with a chance to win and again to come back this week, completely different course, and have another shot to win," Kuchar said. Kuchars last win came at the Memorial last year, and he has eight top 10 finishes this season in 10 events. Hell have the opportunity add to that resume on Sunday, weather permitting, as well as fuel his surging confidence leading into next weeks Masters, where he finished in a tie for eighth last year. The prospect of a winners share of nearly $1.2-million, however, has Kuchar locked in on this weekend first -- even with the prospect of competing for his first major championship looming next week. "Ive been playing some steady golf for a couple of years now and feel like my chances of playing well tomorrow are pretty good," Kuchar said. "Having a four-shot lead is a great position to be in." The golfers went off both tees in threesomes early Saturday morning in anticipation of severe weather in the evening, a format theyll use again Sunday with hopes of avoiding a Monday finish leading into next weeks visit to Augusta National. Garcia, who surged ahead with a 7-under 65 on Friday, began the day with a one-shot lead over Kuchar. That disappeared quickly after the Spaniard bogeyed the first to fall back to 11 under and into a tie with his playing partner, Kuchar. That was just the beginning of the struggles for Garcia, who later put his tee shot into the water on No.dddddddddddd 10. He finished with a 1-over 73 after matching the courses low mark of 12 under after two rounds. "Obviously, I didnt play as well as yesterday with the difficulty," Garcia said. "... It wasnt that easy." Kuchar, meanwhile, birdied the first to move into the lead -- a spot he didnt relinquish. He added back-to-back birdies on No. 4 and 5 to move to 14 under, and he added three birdies in a row on the back nine. He reached 16 under with a birdie on the par-3 14th before three-putting the 18th and settling for 15 under. "Its unbelievable," said Ben Curtis, who is tied for 5th at 8 under with Rickie Fowler. "(Kuchars) on a great roll the last few years. Obviously, hes playing very confidently, and that makes a huge difference." Kuchar missed his first four cuts at the Houston Open, but the American finished tied for eighth in 2010 and 2011 before not playing in the tournament the last two years. His three rounds in the 60s this week have only been matched by Tringale, who shot a 3-under 69 on Saturday while playing in the next-to-last pairing. Phil Mickelson, after withdrawing from last weeks Texas Open with a muscle pull in his right side, was inconsistent from the opening hole Saturday. The five-time major winner left his opening two approach shots short of the green, the second of which found the bunker and caused him to slump over in the fairway. That led to the first of back-to-back bogeys, though he did recover with three straight birdies on the back nine before settling for an even-par 72 -- leaving him in a tie for eighth at 6 under. "I dont know if Ill have a good round tomorrow or not," Mickelson said. "But its close, a lot closer than its been." Fowler matched Kuchars low round in Saturdays chilly conditions, posting a 4-under 68 and moving to 8 under overall. With rain forecast for Saturday night and throughout Sunday, the golfers will once again tee off in threesomes early on Sunday morning. "To me, it feels like well come here and wait around for a lot longer, but (thats) part of the deal," Kuchar said. 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