Manchester United manager Louis van Gaal declared that he was not concerned by his side's performance after their 0-0 draw at fourth-tier minnows Cambridge United in the FA Cup.

Van Gaal selected a strong team for the trip to the Abbey Stadium, but despite the presence of Angel di Maria, Radamel Falcao and Robin van Persie, United could not prevent the fourth-round tie going to a replay.

Jose Mourinho insists his Chelsea stars must ignore talk of a potential quadruple because it is virtually impossible to win all the major prizes.

Mourinho's side will look to keep their challenge for the FA Cup on course when they face third tier Bradford at Stamford Bridge in the fourth round on Saturday and if, as expected, they advance to the last 16 there will be renewed talk of Chelsea hoovering up all four trophies.

Rivals believe Roger Federer can still add another Grand Slam to his record tally after his shock early defeat at the Australian Open.

The Swiss maestro made his earliest exit from the tournament in 14 years when he suffered a four-set loss to Italian veteran Andreas Seppi in the third round on Friday.

Power-serving eighth seed Milos Raonic smashed 22 aces on the way to a straight sets demolition of Benjamin Becker to reach the fourth round at the Australian Open on Saturday.

The Canadian defeated the German 6-4, 6-3, 6-3 in 1hr 41min on Hisense Arena to ease into the round of 16 where he will face Spanish 12th seed Feliciano Lopez.

Klay Thompson set a National Basketball Association record for points in a quarter, netting 37 of Golden State's 41 points in the third en route to a 126-101 demolition of Sacramento.

Thompson, who finished with 52 points after leaving at the 9:28 mark of the fourth quarter, made all 13 of his shots in the third, with nine of them coming from three-point range.

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.