Twickenham played host to two Aviva Premiership matches on Saturday with the straight-forward win for Saracens over Worcester kicking things off, followed by Harlequins entertaining, nervy victory over Bristol. We were there to assess the early season form of the four sides and here are some of the key lessons learnt from the traditional Double Header.Bristol arent here to make up the numbersThey played with heart and ambition against Harlequins with Will Hurrell impressing on his debut alongside Gavin Henson, who played superbly until he was forced off through injury.Though they lost, Bristol look to have the right foundations for a Premiership campaign with the hugely experienced Jordan Crane steering things well at the back of the scrum while the brilliant Jack Lam causes all sorts of mischief at the breakdown.While they may need to bolster their squad in a manner similar to how Worcester did last season, perhaps their most important signing of the close season was their new defence coach Jonathan Thomas. The ex-Wales flanker has built a sturdy resilience in the Bristol ranks which will need to be stamped all over their gameplan if they are to retain their top-flight status.Alex Lozowski starts well for SaracensWith Owen Farrell watching on from underneath a baseball cap on the Saracens bench, it was down to young playmaker Alex Lozowski to pull the strings. Signed from Wasps in the summer, he joined Saracens with promising talent written adjacent to his name, but he has had to hit the ground running with Farrell sidelined by a back injury and Charlie Hodgson now retired.He played well against Worcester, directing the backs with aplomb and dovetailed well with Alex Goode with kicking from hand. He was on the wrong end of some rough justice from GJ Van Velze and a high shot from James Johnston but played the full 80 and looked right at home.Ben Teo needs a platform to shineWith Worcesters game plan focused on gaining territory through kicking, there were seldom opportunities for Teo to get hands on ball. His role was more focused around hard-hitting in defence -- Jamie George felt the full Teo force -- and restricting the space for Saracens backs.If Worcester are to improve on last seasons 11th-placed finish then they will need to add other dimensions to their approach. This was most likely one tailored to cope with the champions, and only when they play a more expansive game -- one where the ball gets beyond the fly-half -- will Teo be able to showcase his attacking potential.Joe Marchants mixed afternoonThe 20-year-old is a talent and this run-out at Twickenham will be a key stepping stone in his development. He has the potential to rival Jonathan Joseph for the England outside centre berth and his brilliant finish in the first-half of Harlequins nervy win over Bristol showcased his wonderful footwork.Then came the slip for Ryan Edwards try where he succumbed to the slippery Twickenham turf and looked on despairingly as the Bristol winger dotted the ball down. But the potential is there, hes on Englands radar and this should be the campaign where he makes his breakthrough.Tom Varndell closes in on Mark Cuetos recordWhen Varndell dropped down to the Championship with Bristol, Cueto -- the Premierships record try-scorer Cueto -- have breathed a sigh of relief. His 90-try haul from his time at Sale is still the most scored in Englands top flight but Varndell is back with Bristol and his first-half score takes his tally to 86.Varndells finishing will be key for Bristol if they are to survive this season and he knows the Premiership like the back of his hand. However, he will want to forget his momentary lapse of concentration as he attempted to charge down a Ruaridh Jackson penalty.Forward pass ambiguity shows its ugly headNew rules were being enforced by the referees at Twickenham with officials cracking down on back chat as well as defenders kicking the ball out of the scrum-halfs hands as they prepare to pick it up from the base of the breakdown. But another needs sorting: the troublesome, debatable forward pass.In Friday nights spectacular match at Kingsholm, Leicesters first try through Manu Tuilagi looked for all the world as if there was a forward pass in the build-up. In Saturdays second match at Twickenham, the pass leading up to Tusi Pisis try looked suspect and then came Marland Yardes inside ball for Marchants sprint home which again seemed to be forward -- certainly the ex-pros on social media believed so.Referee Luke Pearce referred it to the TMO, Rowan Kitt, who said he didnt have a clear angle to show the referee. 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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. ' ' '