Jordan Spieth moved into pole position to progress to the knock-out stages of the WGC-Dell Match Play with a convincing victory over Victor Dubuisson. Spieth sits top of group one after a 5&4 win over the Ryder Cup star, on a day where Bubba Watson and Zach Johnson continued their unbeaten starts. The world No 1 followed his opening day win over Jamie Donaldson by easing to victory over the Frenchman, finishing in style with a birdie at the 14th. Spieth raced in to a three-hole lead inside the opening four holes, but briefly saw his advantage cut to two when he found he bogeyed the 11th after finding the water. Jordan Spieth beat Victor Dubuisson 5&4 A par at the next was enough to regain Spieths three-hole cushion, before Dubuisson ended up in the hazard on 13 and the American kicked-in for the gain at the next to leave an unassailable advantage.Victory means he goes in to his final round-robin match against long-time friend Justin Thomas guaranteed at least a play-off spot, knowing a third win would assure him a spot in the last-16.I always play two down to start because you want to play the rest of them like you need to win your shots back, Spieth told Sky Sports. When we get 2up like we did at the third it resets so were back two down again. The world No 1 will end the group in top spot if he defeats Justin Thomas Thats the way Ive always played Match Play. Weve had success with it in the junior days and now hoping for a little more success as a professional.Its nice to know an opponent (Justin Thomas) where you know whats coming. Itll probably be different being one-on-one but weve had round this year together and know each others games.Spieths Ryder Cup team-mate Jimmy Walker eased past compatriot Robert Streb 4&3, while Dustin Johnson recovered from an opening-day defeat to beat Kiradech Aphibarnrat 5&4 and make it a four-way tie in group eight. Zach Johnson was still left frustrated by a three-putt at the ninth Zach Johnsons 8&6 win over Martin Kaymer was the biggest of the day, while Watsons 2up victory over Emiliano Grillo moves him in to top spot in group four. I think Ive played really nicely, Watson told Sky Sports. Guessing of the wind made it tough, but I didnt make too many mistakes today and hit some quality shots.All in all, a good two days which Im pretty happy with. Also See: WGC-Dell Match Play scores Berger injures hand in WGC exit WATCH: Days monster drive! Golf live on Sky Sports 4 Cheap Air Max 270 China . 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EUGENE, Ore. -- Allyson Felix is supposed to be cementing her track legacy this summer.Instead, she comes into U.S. Olympic trials hobbling, unsure and simply hoping for third place.On a slow, painful comeback from a freak injury to her right ankle, the most decorated female sprinter in U.S. history will have to grit out spots on the 200 and 400-meter teams to have a chance to become the first woman to capture that double at the Olympics.The trials were supposed to be little more than a warmup and a bon voyage party for the 30-year-old, six-time Olympic medalist. But when Felix landed awkwardly on a medicine ball while doing core exercises at her gym in Los Angeles two months ago, everything changed.Ive never seen my ankle that big before, and it happened just immediately, she said. When it happened, there were a number of thoughts running through my head. A scary moment. Id never had anything like that happen before.After the fright, came frustration and a slow recovery.Shes had to alter her workout routine, including running the wrong way around the track, so as not to put as much strain on her right ankle, which, as the outside ankle, is more at risk over counterclockwise trips around the oval.She has not been able to prepare for the grueling schedule that the double will require in Rio. It was Felixs camp that pushed for the scheduling change the International Olympic Committee granted in order to make the double possible. Even with the adjustment, Felix will have to race on five consecutive days, including Aug. 15, which features 200-meter prelims in the morning and the 400 final at night.Maybe most alarming, Felix has barely raced this year. The 400-meter prelim Friday will be only her second test of the ankle in real competition since the injury.She concedes she has thought about scaling back her schedule, maybe to focus on the 200 meters -- her specialty, and the one at which shes won three gold medals at world championships and a gold and two silvers at the Olympics.She hasnt been able to let go of her dream, though.I set those goals long ago, she said. I wanted to fight to be able to have that opportunity. I dont know if Ill ever have it again.Here are five more things to watch at Olympic track trials, starting Friday:ANOTHER DOUBLE?: The worlds best time at 200 meters this year doesnt belong to Usain Bolt. Or Justin Gatlin. Or any other runner who is known for that distance. Rather, it belongs to American LaShawn Merritt, a 400-meter specialist wwhose 200 time of 19.dddddddddddd.78 in April is the best of 2016. Merritt is entered in both the 200 and 400, and the mens schedule at the Olympics is even more friendly for a 2-4 double. Michael Johnson is the only man to do that, back in 1996.ANOTHER RECORD: At the last Olympic trials, Ashton Eaton broke an 11-year-old world record in decathlon. He broke it again last year at world championships. Whats in store next? The defending Olympic champion doesnt go into meets thinking about setting records, but he does believe in Hayward Magic, that mystical feeling he gets when running and throwing at what is, essentially, his home track -- Hayward Field. He said it all but carried him across the line in the 1,500 meters -- the final event of the 2012 decathlon, when he needed to beat his personal best at that distance to set the record. Eatons record now stands at 9,045 points.FIRST THINGS FIRST: Barring surprises, Gatlin will be the main challenger to Usain Bolt when the Olympics roll around. But the 34-year-old has to earn his spot first. It shouldnt be a problem, but with the U.S. rules, in which the top three qualify with no exceptions for past champions or top performers, Gatlin knows hes a false start or a stubbed toe away from being on the outside looking in. You think Olympic Trials, its a dream. Its making dreams happen. People are running with dreams in their eyes, and thats when people are most deadly, he said.DOUBLE THREAT: Before receiver Marquise Goodwin checks into training camp with the Buffalo Bills, he may have to make a short detour. He doubles as a long jumper and has a chance to make it to his second Olympics. The two-time NCAA champion finished 10th at the London Games. He said that less-than-satisfying result gave him a sense of unfinished business. When he started training again under the guidance of 2004 Olympic champion Dwight Phillips, Bills coach Rex Ryan told Goodwin he could have a pass on training camp if he makes the U.S. team.ALL AGES: Among those with good chances to make the Olympics are 18-year-old Vashti Cunningham, the high jumper who is the daughter of former NFL star Randall Cunningham, and 17-year-old sprinter Candace Hill, who has dubbed 2016 the Year of the Youth. On the other end, theres 40-year-old shot putter Adam Nelson, who came out of retirement to try to make his fourth Olympic team. ' ' '