Agnieszka Radwanska revealed Saturday that tips from the legendary Martina Navratilova were turbocharging her quest for a maiden Grand Slam after the Polish sixth seed moved into the final 16 without conceding a set.

Radwanska has rattled through her opponents at this year's tournament, with American Varvara Lepchenko her third consecutive victim to taste the dreaded 6-0 "bagel" in their third round match.

Philadelphia 76ers guard Tony Wroten, the NBA club's leading scorer, will be sidelined indefinitely because of a torn right knee ligament, the team announced Friday.

Wroten suffered the anterior cruciate ligament injury against New Orleans on January 16.

Top seed Serena Williams powered into the Australian Open fourth round on Saturday, but only after sister Venus inspired her to shake of a sluggish start against Ukrainian 26th seed Elina Svitolina.

The 18-time Grand Slam champion conceded her first set of the tournament to Svitolina, continuing a run of slow starts, before Venus' hard-fought run into the final 16 at Melbourne Park convinced to her to knuckle down.

Japan were sent crashing out of the Asian Cup on Friday as the United Arab Emirates shocked the defending champions 5-4 on penalties after a pulsating quarter-final.

Substitute Ismail Ahmed delivered the knockout blow after Japanese superstars Keisuke Honda and Shinji Kagawa had both missed their spot kicks, sending the UAE through to the last four after a war of attrition in Sydney that finished 1-1 after extra time.

Rafael Nadal put his health issues behind him to overcome Israeli Dudi Sela and advance to the fourth round at the Australian Open on Friday.

The Spaniard, who struggled with stomach cramps and dizzy spells in his five-set second-round win over American Tim Smyczek, showed none of the symptoms as he beat Sela 6-1, 6-0, 7-5 in 2hr 4min on Rod Laver Arena.

Germany forward Lukas Podolski says he plans to retire from international football following Euro 2016 in France after more than a decade of playing for the reigning world champions.

The 29-year-old midfielder has made 121 appearances for Germany, having made his debut in 2004, and the France tournament would be his fourth European Championships.

Iraq beat fierce rival Iran 7-6 in a penalty shootout after a 3-3 draw on Friday, booking a place in the Asian Cup semifinals against South Korea.

Iran, which played with 10 men after halftime, twice equalized in a four-goal extra time to send the match to a lengthy penalty shootout, which ended when Salam Shakir converted after Iran's Vahid Amiri hit the post.

Kobe Bryant tore his right rotator cuff in the Los Angeles Lakers' latest defeat, the club announced on Thursday.

Bryant injured his right shoulder in the second half of the loss at New Orleans on Wednesday when he drove the baseline for a two-handed dunk.

Nine-time world champion Sebastien Loeb returned to rally racing in style as he took command of the season-opening Monte Carlo Rally on day one Thursday.

The Frenchman, who has won the race seven times and ended his full-time rally career in 2012, won the opening special stage held at night in his Citroen, then settled for third behind defending world champ Sebastien Ogier, and Jari-Matti Latvala in second.

South Korea reached the Asian Cup semifinals after Son Heung-min scored two goals in extra time in a tough 2-0 win over Uzbekistan.

Kim Jin-su's long centering pass from just outside the area was deflected by the Uzbekistan defense and into the path of Son, who headed the ball past diving goalkeeper Ignatiy Nesterov 16 minutes into extra time.