Sebastian Coe said track and field will continue to experiment with innovation as the sport attempts to win back fans following recent scandal. Speaking as the curtain was set to come down on the World Indoor Championships, the International Association of Athletics Federations (IAAF) president said changes introduced in Portland could feature at next years World Outdoor Championships in London.In the shot put, long jump and triple jump the field was whittled down to the top four athletes for the final attempts in each event, with the changes made in order to ensure that the entire focus of the crowd was on the finale of each event as it took place. Great Britains Robbie Grabarz competes in the high jump final at the IAAF World Indoor Championships in Portland While the innovations appeared to be well-received by spectators, they were not universally embraced by athletes, with New Zealand shot put star Valerie Adams complaining on Saturday about delays in her event. However, Coe said the spirit of change represented the future.Its really important that when we have the opportunity to road test innovation we take it, Coe said.Not everything were going to do is going to work. But Id rather be in a sport where we sometimes have to say Okay, that didnt work quite as planned rather than sitting there sclerotically for the next 10 years. IAAF president Sebastian Coe You arent going to see growth and development of the sport like that if you dont innovate.Some of the things that weve road-tested here youll see in other formats. And youll see evidence of that in London 2017 and beyond.Coe meanwhile insisted that the absence of Russia in Portland - banned from competition after last years World Anti-Doping Agency (WADA) report which uncovered a systemic doping regime in Russian athletics - had not tarnished the meeting. Burundis Francin Niyonsaba (R) and Great Britains Lynsey Sharp compete in the 800m at the IAAF World Indoor Championships in Portland He said: Its a sad moment for our sport ... but it hasnt stopped this from being a fantastic athletic experience for spectators and athletes alike.Coe said the attendances at the Oregon Convention Center - which have been close to sold out over the four days of competition - indicated that the sport retained support despite drugs and corruption scandals.It shows you that the sport is still very strong, Coe added. Nobody is denying the challenges that lie ahead to regain trust but this has been a pretty good start. Also See: Kotlyarova tests for meldonium Grabarz bags high jump silver Bronze for Ugen and Porter Fired up Oldham ready to swing Denyi Reyes Jersey . Louis Blues brought in the premier unrestricted free agent centre, and did it without breaking the bank. Nathan Eovaldi Jersey . 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DOVER, Del. -- Jimmie Johnson handled the pothole at Dover the same way he disposed of a rough patch to start the season. He won. A week after shaking off a lengthy winless streak by his championship standards, Johnson raced his way to another routine romp at Dover International Speedway. He followed last weeks victory in the Coca-Cola 600 with another sensational run at Dover, extending his track victory record to nine. Johnson was the class of the field in a race red-flagged for 22 minutes to repair a pothole in the concrete track. "Whatever they put in the pothole, it worked awfully well," Johnson said. His No. 48 Chevrolet was even better. Johnson led 272 of 400 laps, and won consecutive races for the 13th time. The six-time Cup champion swept Dover in 2002 and 2009 and won races in 2005, 2010, 2012 and 2013. Brad Keselowski was second, followed by Matt Kenseth, Clint Bowyer and Denny Hamlin. "For sure, when you come to Dover, its always the 48," Kenseth said. "Weve got to figure out how to get ahead of him." Good luck. Johnsons checkered flag celebrations at Dover have seemingly become a rite of the NASCAR season. He became Dovers career leader in laps led when he hit the 2,802 mark, and again stamped himself as contender for a series-tying seventh championship. "Its amazing that we can stay on top of things here with the different generation car, different rules, different tires," Johnson said. "This place just fits my style and (crew chief) Chad Knaus style." His lone regret, that owner Rick Hendrick was not at the track. Johnson is heating up right as the NASCAR heads into its summer schedule. Up next, Pocono, where Johnson won last season and has two other wins. "We can get on a roll," he said. "Weve got some good tracks ahead of us." Johnson had some wondering what was wrong after an 0 for 11 start to the season. Turned out, it was nothing racing at some of his favourite tracks couldnt fix. But Johnson also revealed he had surgery to repair three hernias at the end of last season, which cost the No. 48 team testing time. "We felt like it was time to shut things down and let the team kind of recoup," he said. Johnson never left any doubt his No. 48 Chevrolet was the car to beat, the only drama coming when the race was stopped 160 llaps into the race after Ryan Newmans car pulled up chunks of the track that kicked back and damaged Jamie McMurrays car.ddddddddddddThe race was soon stopped and crews werent allowed to work on the cars. McMurrays plea for an exception was denied. "It killed the front-end," he said. "Our guys did a really good job recovering here putting all the stuff on and we salvaged what we could." More pieces of the track flew up and cracked a window on the pedestrian crossover bridge. NASCAR officials and safety crews went to work on the potholes and applied a quick-drying concrete mix. Cup races were infamously delayed by potholes at Martinsville in 2004 and the 2010 Daytona 500. McMurray won at Daytona in 2010. "It started to come back up at the end, but I didnt think it was a major issue," Keselowski said. "It was definitely a major issue at first when it happened. I could feel it when I was driving over it, and you knew it was only going to get worse." Kevin Harvick might have wished for a longer delay. Harvicks lead at the red flag evaporated because of a flat tire not long after racing resumed and he fell two laps behind Johnson. Harvick worked his way back into a 17th-place finish. Kyle Busch led the first 81 laps before Johnson passed him. Buschs bid for a tripleheader sweep at Dover would soon end when the No. 18 Toyota slammed into the outside wall. Bowyer moved into Buschs line, which caused him to wreck 124 laps into the race. "It was one of those deals where I thought I was clear, obviously, and wasnt and ruined his day and certainly didnt help mine," Bowyer said. Busch, who became the 15th driver to pass 10,000 career laps led, won the Truck Series race Friday and the Nationwide race Saturday. He has the only three-race sweep since NASCAR expanded to three national series in 1995, accomplishing the feat in 2010 at Bristol. Busch, who did not talk to the media, is 1 for 9 in Cup races after winning the first two in the same weekend. Busch had some company in the garage. AJ Allmendinger turned into Greg Biffle and Ricky Stenhouse Jr. on Lap 135, which knocked out the Roush Fenway Racing teammates. Biffle, though, later returned to finish. "They were racing hard back there and he stuck it into a hole that maybe there wasnt room for," Biffle said. ' ' '