OMAHA, Neb. -- Its never been so crowded at the top of the U.S. Senior Open leaderboard. When Tom Lehman chipped in from 45 feet on the 18th hole Thursday, he joined six others at 3-under 67 for the first round at the Omaha Country Club. There had never been as many as seven co-leaders after the opening round of the event. The previous record was five in 1997. "In one round, 18 holes, its like a sprint," Lehman said. "Over the course of four rounds, which is more like a marathon, things really do spread out. The field will thin out." Kenny Perry shot a 67 in the morning, putting together a solid start in his bid for a second straight win in a senior major. Michael Allen and Jay Don Blake also were 3 under after their morning rounds, and Gary Hallberg, Mark OMeara, Fred Funk and Lehman came in with the same score in the afternoon. The hilly 6,700-yard course took a toll on the field of golfers age 50 and older, especially in the afternoon as temperatures reached the upper 80s with a light breeze. The small and undulating greens browned up in the heat and proved dicey. "When you get tough conditions and youre playing good, you get rewarded," Funk said. "More than likely, the guy thats playing the best in these kind of conditions will be at the top. Hopefully, it will be me." Perry, who won the Senior Players Championship two weeks ago at Fox Chapel, Pa., made five birdies against two bogeys. The season points leader started on the back nine and had birdies on three of his first eight holes. He hit an 8-iron to within 10 feet on the par-3 11th, drove the green on the 312-yard, par-4 13th, and hit hybrid-pitching wedge on the 319-yard, par-4 17th and made his 15-foot putt. He birdied both par-5s on his second nine, but came away a bit disappointed after missing a 5-foot eagle putt on No. 6. "I took care of the par 5s today and drove it nicely, kept it in the fairway, kept it in play," Perry said. "Like I said yesterday, if I hit it in the fairway, I really like my chances on this golf course." Lehman, the 2012 Champions Tour points and money leader, overcame a bogey on No. 8 with three birdies on the back nine -- none bigger than the one on 18. His second shot came to rest in thick grass to the right of the green. He used an 8-iron for his chip and watched it roll downhill slowly into the cup for what ranked as the shot of the day. "The lie was a little bit squirrely," Lehman said. "The grass was growing against the ball so its easy to kind of not catch it cleanly. I took less loft and kind of hit it a little bit thin. Once it gets out on the green, its going to get down there." Chien Soon Lu, Peter Senior, Rocco Mediate and 2010 champion Bernhard Langer shots 68s. Colin Montgomerie, who turned 50 last month and is playing in his second senior event, was in a pack that was two shots behind. Defending champion Roger Chapman struggled with his putter and was seven shots behind after a 74. Tom Watson, who played with Langer and Montgomerie and drew the largest galleries of the day, struggled with his irons while shooting a 70 that included one birdie and one bogey. "I hit a few good shots today, but for the most part, my shots werent very solid," Watson said. "One good thing about it was that I got about the best score I possibly could out of my round." Fred Couples, coming off three straight runner-up finishes on the Champions Tour, had a 1-over 71. Couples, like others, had difficulty figuring out the speed of the greens. The recent heat wave has put stress on them, and warmer temperatures are forecast this weekend. "Theyre suffering," Lehman said. "And theres differing kinds of grass. Thats probably the biggest thing. Its not 100 per cent pure. 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Cheap Oilers Jerseys . -- Derrick Rose shook off poor shooting early to hit clutch shots late and Carlos Boozer had 20 points and 13 rebounds to lead the Chicago Bulls to a 104-95 preseason victory over the Oklahoma City Thunder on Wednesday night.Warrington coach Tony Smith has dismissed speculation he could become the new boss of Hull KR.Current Rovers coach James Webster is under contract until the end of the season and Smith, who lives in West Yorkshire, has been linked with the role with his own deal due to expire at the end of the year.But Smith confirmed he will speak to Warrington owner Simon Moran in the next little while to discuss the clubs future plans. It was just speculation, Simon and I - my boss here at Warrington - talk each year and sit down at the right times and discuss things at the right times, he told Sky Sports News HQ. Barrie McDermott discusses Dan Sarginson and Josh Charnleys departures from Wigan and previews this weekends Super League action I am off contract at the end of the year and somebody has linked that probably to the secrecy of the announcement of the Hull KR coach so its speculation maybe to find out whether I was the secret bidder.dddddddddddd.But certainly not, thats not the case and Simon and I will sit down in the next little while and have a chat about our future here at Warrington.Also See:Hull FC hands Wolves first defeatWATCH: Super League previewRugby League on SkyFollow @SkySportsRL ' ' '