Manchester United defender Rio Ferdinand has warned champions Manchester City that his side's swoop for Arsenal striker Robin Van Persie could tilt the balance of power in the Premier League back to Old Trafford.

With the new Premier League campaign starting on Saturday, United have landed a significant blow before the first ball has even been kicked after Dutch star Van Persie decided to snub City in favor of a move to Sir Alex Ferguson's team.

Young Chilean striker Angelo Henriquez is to join Manchester United, his club Universidad de Chile announced in a statement on Friday.

"Angelo Henriquez will join Manchester United this month," said Universidad de Chile, the 2011 winners of the Copa Sudamericana, South America's equivalent of the Europa League.

Robin Van Persie became the latest big-name player to slip from Arsenal's grasp when the Netherlands striker completed his move to Manchester United on a four-year deal on Friday.

Van Persie agreed personal terms and passed a medical examination to complete a transfer that is believed to have cost United about 24 million pounds ($38 million).

Olympic gold medalist Andy Murray was brought back to earth on Thursday with a surprise defeat by unseeded Jeremy Chardy at the Western and Southern Open.

While his regular rivals Roger Federer and Novak Djokovic won through to the quarterfinals, Murray lost 6-4, 6-4 to Chardy, an opponent he'd beaten easily the four previous times they'd played.

Once the big-spending nouveaux riches of Spain's La Liga, Malaga are suddenly struggling after their owner, wealthy Qatari Sheikh Abdullah Al-Thani, turned off the money tap.

Other hugely indebted top-flight clubs had watched with envy as Malaga splashed out nearly 60 million euros ($74 million) on new players last summer and ended last season in fourth place, their best ever campaign.

Rafael Nadal, who pulled out of the U.S. Open due to injury, should be ready for the Davis Cup semifinal between Spain and the United States next month, the tennis ace's coach and uncle said Thursday.

The Spaniard withdrew on Wednesday from the U.S. Open, the final Grand Slam of the season, which starts in New York on August 27, because of his continuing battle with knee tendinitis.

Liverpool agreed a deal to sign Morocco winger Oussama Assaidi from Dutch club Heerenveen for an undisclosed fee on Thursday.

Assaidi has to pass a medical before the transfer can be rubber-stamped, but if it is completed successfully he will become new boss Brendan Rodgers' third signing since he took over from Kenny Dalglish in June.

Arsenal coach Arsene Wenger said he would have preferred to sell star striker Robin Van Persie to Paris St. Germain rather than Premier League rivals Manchester United.

Van Persie is expected to complete his move to Old Trafford within the next 24 hours after Arsenal accepted a bid of around £22 million ($34 million) for their captain.

Tottenham manager Andre Villas-Boas said Luka Modric is training on his own while the midfielder holds discussions with Real Madrid about a move to the Spanish champions.

The Croatia international is widely reported to be on the verge of joining Madrid in the coming days, ending his four-year spell at Tottenham.

Manchester United said Wednesday they had agreed a deal to sign Dutch striker Robin Van Persie from Premier League rivals Arsenal.

"Manchester United is pleased to announce it has reached agreement with Arsenal Football Club for the transfer of Robin Van Persie," said a club statement.