Defending champion Brett Rumford of Australia fired his second successive four-under 67 on Friday to share the early European Masters second round lead with overnight leader Rory McIlroy. British teenager McIlroy saved par three times to finish with 71 and match Rumford's eight-under 134. The pair are a stroke ahead of Juan Abbate of Argentina (67) and Spaniard Alejandro Canizares (68). Rumford's move to the top of the leaderboard has come after a mediocre run by the 31-year-old on the US PGA Tour where he is struggling to keep his card. The three-time European Tour winner explained why he has turned his fortunes around again. “Einstein said the definition of insanity is doing something over and over again and expecting a different result,” Rumford told reporters. “That's the trap golfers very often get stuck in. The trick, I've found, is to identify something that's not working and change it.” McIlroy's change in fortunes did not affect the 19-year-old Northern Irishman, whose first round 63 was only a stroke off the Crans-sur-Sierre course record. “It's always difficult following a low round,” the co-leader told reporters. “My ironplay was not as good as Thursday and I holed a lot of par putts on the back nine to keep me going so a 71 was pretty good.” BMW event postponed In Missouri, the first round of the PGA BMW Championship was postponed after the remnants of Hurricane Gustav dumped rain on the area. Officials rescheduled the first round to be played on Friday at the Bellerive course, and plan to play 36 holes on Saturday to get the event back on track for a Sunday finish. PGA Tour tournament director Slugger White said that Gustav was scheduled to be gone by Thursday afternoon, and that the forecast for the rest of the week was good. Due to the small 69-man field, there should be no problem playing 36 holes on Saturday, he said. The BMW Championship is the third of four events on the PGA Tour's FedEx Cup playoff series.