MANCHESTER, England -- England defender Luke Shaw became the worlds most expensive teenage player on Friday and Manchester Uniteds second signing in 24 hours following its worst English Premier League campaign. The 18-year-old left back joined United from Southampton, reportedly for more than 27 million pounds ($46 million), straight after returning from his first World Cup with England. Southampton confirmed the deal made Shaw "the most expensive teenager ever," which would eclipse fees of around 26 million pounds ($44 million) that saw Wayne Rooney join Manchester United in 2004 and Marquinhos sign for Paris Saint-Germain last year. Shaw signed a four-year contract, with an option to extend for a further year if he continues to develop as one of the most exciting youngsters in football. "I want to continue to progress my career and joining United is the ideal place for me to do that," Shaw said in a statement. Louis van Gaal doesnt officially take charge at United until his World Cup campaign as Netherlands manager is over, but players are being signed ready for the Dutchmans arrival. United paid around $50 million for Spanish midfielder Ander Herrera the day before Shaws arrival. The record 20-time English champions are spending early in the summer transfer window after dithering last year in the post-Alex Ferguson era led to an alarming, and costly, slump on the pitch. David Moyes was fired just before the season ended with United going from 2013 champions to seventh-place finishers last month. Uniteds management has convinced Shaw to join them despite the lack of Champions League football next season. Having already made 67 first-team appearances at Southampton, Shaw will be hoping he isnt just the backup to 33-year-old Patrice Evra at left back. "Luke is a very talented young left back with great potential," assistant manager Ryan Giggs said. "He has developed immensely during his time at Southampton." Shaw usurped Ashley Cole as backup to Leighton Baines in the England World Cup squad, leading to the Chelsea veterans international retirement. Shaw, who made his international debut only in March, won his third cap in Tuesdays 0-0 draw with Costa Rica before Englands early exit from Brazil. Shaw is the latest departure from Southampton since the south-coast club achieved its highest-ever Premier League points tally to finish eighth in May. Manager Mauricio Pochettino left for Tottenham, striker Rickie Lambert joined Liverpool, and midfielder Adam Lallana is also set for a move to Anfield. Jim Kelly Jersey .com) - The Grand Slam season will get underway Monday at the Australian Open in Melbourne, where a new champion will be crowned this year. 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The seventh-ranked Swiss converted his first match point with a delightful backhand volley, but is still looking for his best tennis and a strong finish to the most difficult season of his career. Earlier, Federers chances of qualifying for the ATP World Tour Finals in London next month improved when Richard Gasquet was beaten 6-4, 6-2 by fellow Frenchman Michael Llodra in a first-round match. Also Wednesday, top-seeded Juan Martin del Potro of Argentina eased past Swiss wild card Henri Laaksonen, 6-4, 6-4. Seeded players continued to tumble with the fifth-seeded Gasquet followed by No. 6 Kei Nishikori of Japan, who lost 6-1, 6-2 against Ivan Dodig of Croatia. Eighth-seeded Grigor Dimitrov beat Radek Stepanek of the Czech Republic 6-3, 6-3 and the Bulgarian is on course to meet Federer in the quarterfinals Friday. Federers struggles with back injuries and unheralded opponents since Marchh have meant he still has not secured a place in the eight-man London lineup next month.dddddddddddd Gasquets defeat, after Stanislas Wawrinkas first-round exit Tuesday, strengthened Federers hold on the sixth qualifying position in the points race before he played Istomin. Still, home fans were silenced when Istomin broke Federers serve in the fifth game before serving out the set. Federer needed a single break, in the sixth game, to level the match though appeared to show unease by asking the chair umpire to reject balls he thought were too soft for play. In the first game of the deciding set, Federer let two break point chances slip as Istomin escaped trouble with big serves. After saving four break points in his Federer saved four break points in next game and held despite his forehand again proving unreliable. Federer eventually led when he broke for a 2-1 advantage with a powerful forehand winner approaching the net, and reeled off four more games for victory. In other matches, Paul-Henri Mathieu of France beat Denis Kudla of the United States 6-4, 7-5, and Canadian Vasek Pospisil won 6-4, 6-4 against Robin Haase of the Netherland, who was a finalist in Vienna on Sunday. ' ' '